The human–primate interface in the New Normal: Challenges and opportunities for primatologists in the COVID‐19 era and beyond - Wiley

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1 INTRODUCTION

The COVID‐19 pandemic is having catastrophic impacts on human health and livelihoods around the globe. At the time of writing in June 2020, >8.5 million people globally have tested positive for SARS‐CoV‐2, the virus that causes COVID‐19, and >450,000 have died (World Health Organization, 2020), with no end in sight. Human actions to mitigate the impacts of COVID‐19 include border closures and other restrictions on movement and association, closures of government offices, schools, and other public institutions, mandatory and voluntary business closures, stay‐at‐home orders, and voluntary physical distancing. These responses have also negatively impacted human health and welfare, causing severe economic hardship (Fernandes, 2020), increasing marginalization of vulnerable populations (Khalid, 2020; United Nations, 2020; Van Lancker & Parolin, 2020), disruptions to education (Van Lancker & Parolin, 2020; Viner et al., 2020) and health care (Adams & Walls, 2020), and severe psychosocial stress (Rajkumar, 2020).

SARS‐CoV‐2 is zoonotic in origin and appears to have infected humans during a single crossover event (Zhang, Wu, & Zhang, 2020; Zhou et al., 2020). Zoonosis can occur when individuals of different species interact at their interfaces. Human–wildlife interfaces are complex and rapidly changing as a result of increasing human incursions into wildlife habitats (Cunningham, Daszak, & Wood, 2017) and expanding trade in wildlife and wildlife parts (Johnson, Hitchens, Pandit et al., 2020; Mehta, 2020). Better surveillance and understanding of human–wildlife interfaces, particularly those involving taxa closely related to humans (i.e., the nonhuman primates), is crucial to prevent future crossover events.

Human and nonhuman primates (hereafter “primates”) are sympatric across the primate distribution range, and some human–primate interfaces involve frequent and close contact, producing opportunities for zoonosis and other negative outcomes. Our objectives in this commentary are to highlight challenges and opportunities at the human–primate interface in light of the COVID‐19 pandemic and to make specific recommendations for researchers working with wild primates during (and, we hope, after) the pandemic. We begin by briefly reviewing the evidence for zoonosis at the human–primate interface and the risk of human‐to‐primate zoonosis of SARS‐CoV‐2. Next, we identify challenges that have been revealed or exacerbated during the pandemic, with a specific focus on the disruption of long‐standing provisioning relationships. We then discuss research and educational opportunities that the COVID‐19 pandemic has created or revealed, particularly with regard to reducing human–primate conflict and risk of zoonosis. Finally, we make specific recommendations for researchers and conservation managers in light of the pandemic and beyond‐pandemic realities. Although humans have provisioning relationships with wild primates across much of their distribution range (Lee & Priston, 2005; Priston & McLennan, 2013; Sabbatini, Stammatia, Tavares, Giuliani, & Visalberghi, 2006), here we focus on examples from Asia, a region where deeply entrenched cultural practices of primate feeding (Lee & Priston, 2005; Malaivijitnond & Hamada, 2008; Malaivijitnond, Vazquez, & Hamada, 2011) have been disrupted by particularly stringent controls on movement in response to the COVID‐19 pandemic. Asia is also of particular interest as a crucial hotspot for emerging infectious diseases from wildlife (Morse et al., 2012).

As we move through the COVID‐19 pandemic, communities are making consequential decisions about how to balance the need to mitigate the risks of COVID‐19 with other health, social, and economic priorities, and primatologists should be part of these conversations. To reach a “new normal,” some entrenched, and even cherished, practices are changing, because the pandemic has shown that we can, and must, reimagine the ways that we interact with wildlife and each other.

2 THE ZOONOTIC ORIGINS OF SARS‐COV‐2 AND HUMAN–PRIMATE ZOONOSES

The vast majority of pathogenic viruses, protozoa, and helminths, and many bacteria and fungi affecting humans are zoonotic, and most of these (~80%) circulate in other mammals (Morse et al., 2012). Tracing the origins of zoonotic diseases is difficult, as most pathogens circulating in wildlife have not yet been identified or described (Andersen, Rambaut, Lipkin, Holmes, & Garry, 2020; Cunningham et al., 2017; Li et al., 2005). Based on its similarity to viruses detected in wild bats, SARS‐CoV‐2 is likely to have emerged from a bat coronavirus (Andersen et al., 2020; Li et al., 2005; Zhou et al., 2020); however, the means by which the virus was transmitted to humans has not been determined yet (Li et al., 2005; Liu et al., 2020).

Primates, our closest evolutionary relatives, have been implicated in a number of zoonotic disease outbreaks in humans (Morse et al., 2012). Primate‐to‐human zoonotic transmission is implicated in the origins of HIV/AIDS (Peeters et al., 2002), as well as sporadic human infection with several diseases, including simian malaria (Plasmodium knowlesi ), Simian Foamy Virus, monkeypox, Herpes B, Kyasanur Forest Disease virus, and other pathogens (Essbauer, Pfeiffer, & Meyer, 2010; Feeroz et al., 2013; Gillespie, Nunn, & Leendertz, 2008; Holbrook, 2012; Ngernna et al., 2019; Sato et al., 2019; Switzer et al., 2004; Tischer & Osterrieder, 2010; Yadav et al., 2020). Primate‐to‐human zoonosis is also suspected in some outbreaks of filoviral hemorrhagic fevers such as Marburg and Ebola (Changula, Kajihara, Mweene, & Takada, 2014; Gillespie et al., 2008).

Primates are also particularly susceptible to human pathogens (Boesch, 2008; Calvignac‐Spencer, Leendertz, Gillespie, & Leendertz, 2012; Gillespie et al., 2008; Patrono et al., 2018). For example, the bacteria that cause tuberculosis, a chronic airborne disease resulting in high morbidity and mortality in both humans and primates, can be bi‐directionally transmitted (Bushmitz et al., 2009; Lécu & Ball, 2011; Mätz‐Rensing et al., 2015). From 2002 to 2004, major Ebola outbreaks in central Africa killed up to 95% of individual western lowland gorillas (Gorilla gorilla gorilla ) in affected populations (Genton et al., 2012). While it is unclear whether this occurred due to human‐to‐primate disease transmission or whether both were infected by another animal host, this incident and many others (Boesch, 2008; Holzmann, Agostini, Areta, Beldomenico, & Di Bitetti, 2010; Lappan, Sibarani, Rustiati, & Andayani, 2017; Nunn, 2006) demonstrate the potentially catastrophic consequences of infectious disease epidemics for primates already threatened with extinction. Accordingly, great ape researchers have long emphasized the importance of biosafety practices to reduce the risk of human‐to‐primate zoonosis in research, tourism, and conservation programs, developing and promoting best practice guidelines for great ape health monitoring and disease control (Gilardi et al., 2015) and tourism (Macfie & Williamson, 2010). However, implementation of recommended practices for great apes has been inconsistent (Daud, 2019; Hanes, Kalema‐Zikusoka, Svensson, & Hill, 2018; Singh, 2020), and these measures are rarely discussed or used for other wild primates.

On March 15, 2020, the International Union for Conservation of Nature (IUCN) released a statement emphasizing the risk that SARS‐CoV‐2 poses for great apes, and stressing the importance of risk mitigation (IUCN, 2020). However, SARS‐CoV‐2 should be considered a potential threat to all wild primates, not just the great apes (Gillespie, 2019; Santos, Guiraldi, & Lucheis, 2020). Rhesus macaques exposed to SARS‐CoV‐2 develop symptoms similar to COVID‐19 (Bao et al., 2020; Shan et al., 2020), and all apes and all African and Asian monkeys examined in a recent study share an identical amino acid sequence with all 12 of the sites on the human angiotensin‐converting enzyme 2 (ACE2) receptor that are critical for SARS‐CoV‐2 binding (Melin, Janiak, Marrone, Arora, & Higham, 2020). These preliminary findings indicate that all catarrhines, as well as some lemurs, may be highly susceptible to infection with SARS‐CoV‐2 (Melin et al., 2020). Infection of wild primates with SARS‐CoV‐2 has the potential to create a new wild reservoir for the virus, which will substantially complicate efforts to prevent future human outbreaks of COVID‐19 and create new opportunities for viral evolution. Close contact between sympatric primate species is common, which means that a sustained outbreak in any wild primate species may result in epizootics in other species as well, potentially resulting in waves of population declines or local extinctions.

3 RISK OF ZOONOSIS AT THE HUMAN–PRIMATE INTERFACE

Human–primate interfaces, including provisioning, research activities, hunting, primate‐related ecotourism, and the keeping of primates as pets, can result in close spatial proximity and may lead to physical contact, thereby creating opportunities for zoonosis (Balasubramaniam, Sueur, Huffman, & MacIntosh, 2020; Filippone et al., 2015; Jones‐Engel, Engel, Schillaci, Babo, & Froehlich, 2001; Muehlenbein & Wallis, 2017). Humans and primates share space across many different habitats spanning the primate distribution range, including forests, open woodlands, agricultural landscapes, roadsides, villages, and urban landscapes (Estrada et al., 2017; Hockings et al., 2015; Radhakrishna, Huffman, & Sinha, 2013). Because humans and primates have broadly similar physiological needs and diets, these sympatric contexts can lead to ecological competition in forests and agricultural landscapes (Hockings, Parathian, Bessa, & Frazão‐Moreira, 2020; Riley, 2007), as well as create opportunities for provisioning and other close encounters between species.

People feed wild primates in parks, beaches, temples, human settlements, and along roadsides (El Alami, Van Lavieren, Rachida, & Chait, 2012; Hsu, Kao, & Agoramoorthy, 2009; Koirala et al., 2017; Malaivijitnond et al., 2011; Sabbatini et al., 2006), with many negative consequences for both humans and primates (Maréchal, Semple, Majolo, & MacLarnon, 2016; Morrow, Glanz, Ngakah, & Riley, 2019). Most deliberate feeding involves terrestrial or semi‐terrestrial primates, but in fragmented habitats, even strictly arboreal species such as siamangs (Symphalangus syndactylus ; T. Q. Bartlett, personal communication, July 1, 2017), Javan gibbons (Hylobates moloch ; R. Oktaviani, personal communication, February 19, 2020), agile gibbons (H. agilis ; M. Iqbal, personal communication, May 13, 2018), dusky langurs (Trachypithecus obscurus ; S. Malaivijitnond, personal obs. May 17, 2019), and silvery langurs (T. selangorensis ; TripAdvisor, 2014) are sometimes fed. Primates also forage on garbage around human settlements, sometimes entering homes and public facilities (Md‐Zain, Ruslin, & Idris, 2014; Naher, Khan, & Ahmed, 2017), which may not always require close physical proximity to humans but can result in disease transmission through the handling or ingestion of fomites (Sapolsky & Share, 2004).

In many parts of the primate distribution range, the practice of keeping primates as pets is common (e.g., Amazonia: Cormier, 2003; Indonesia: Jones‐Engel et al., 2001; Jones‐Engel, Schillaci, Engel, Paputungan, & Froehlich, 2005); posing risks for zoonotic disease transmission. For example, in Sulawesi, Indonesia, Jones‐Engel et al. (2001) found evidence of exposure of pet Sulawesi macaques to endemic human pathogens, including measles, influenza A, and parainfluenza 1, 2, and 3: all respiratory viruses that are easily transmitted and highly contagious. It is believed that the pet macaques likely acquired the pathogens as a result of close interaction with their owners and other members of the village. The fact that the same human pathogens were also detected in wild populations suggests that the pet macaques may act as a sort of “vector” (from human to wild populations) since wild macaques are often attracted to pet ones (e.g., when females are in estrus; Jones‐Engel et al., 2005). The pet trade may also create opportunities for primate‐to‐human zoonosis of emerging infectious diseases. One example is the trade of Asian apes. There is some evidence that Asian apes may often be captured opportunistically for pets as land is deforested and converted to agriculture (Freund, Rahman, & Knott, 2017; Nijman, Spaan, Rode‐Margono, & Nekaris, 2017). The concern here is that wildlife in recently deforested areas may be particularly vulnerable to zoonosis, and therefore may have higher pathogen loads, because of compression of multiple species into smaller spaces (Borremans, Faust, Manlove, Sokolow, & Lloyd‐Smith, 2019; Cunningham et al., 2017; Mehta, 2020).

4 COVID‐19 AND DISRUPTIONS TO THE HUMAN–PRIMATE INTERFACE: MAJOR CHALLENGES AND OPPORTUNITIES

4.1 Challenges created or exacerbated by the COVID‐19 pandemic

4.1.1 Reduced nutrition for primates

Human provisioning can offer substantial nutritional benefits to wild primates, although those benefits may not be experienced by all group members (El Alami et al., 2012; Marty et al., 2019; Sinha & Mukhopadhyay, 2013). While some primate populations that forage in temples, villages, and towns also have access to wild foods in adjacent forests, other populations that live in urban landscapes where wild foods are scarce may be highly nutritionally dependent on anthropogenic food. However, throughout much of Asia, changes in human behavior in response to the COVID‐19 pandemic have disrupted human–primate feeding interactions. For example, nationwide movement controls in Bangladesh, India, Malaysia, Thailand, and Vietnam and more localized controls in China, Indonesia, and the Philippines initiated in mid‐to‐late March 2020 prohibited most people from leaving their homes for purposes other than essential work, medical care, or to obtain necessities such as food and medicine. In addition, border and park closures have also sharply restricted the number of tourists visiting recreational areas such as parks, beaches, and temples where primates are routinely fed (Bisht, 2020; Phull, 2020; Pulitzer, 2020). As a consequence, many of these primate populations that have been nutritionally dependent on human handouts for generations are now experiencing an abrupt loss of this food source (Bangkok Post, 2020; Kieu, 2020).

4.1.2 Increased intraspecific competition for resources

For primate populations that are nutritionally dependent on provisioned foods, intraspecific competition is inevitable when rates of provisioning are reduced. For example, in Lopburi, a small city in Thailand that celebrates its large urban monkey population with an annual Monkey Festival (Kieu, 2020), local residents have reported observing intense aggression between two large groups of long‐tailed macaques that previously foraged in separate areas (Bangkok Post, 2020; Kieu, 2020). One group depended on handouts from tourists visiting the Prang Sam Yod temple, and the other relied on tourists visiting the Phra Kan Shrine, closer to the city center (Thaitrakulpanich, 2020). Witnesses reported that reduced provisioning of the Prang Sam Yod group caused them to move into the range of the city group, resulting in intense conflict involving hundreds of monkeys (Kieu, 2020; Thaitrakulpanich, 2020). To mitigate the conflict, local officials have started provisioning the monkeys at both temple sites (Johnson & Tun, 2020; Thaitrakulpanich, 2020).

4.1.3 Increased poaching

Despite laws against hunting of protected species, poaching has become a greater problem during the COVID‐19 lockdowns likely due to a combination of increased economic and nutritional stress in marginalized communities and reduced intensity of law enforcement (WCS, 2020). For example, in Sabah, Malaysia, even though wildlife conservation is listed as an “essential” activity, rangers were not allowed to patrol during the country's movement control order unless there was actual evidence of poaching, and as a result, illegal hunting activities have increased (Lee, 2020). Many forest areas across India have also seen an increase in wildlife poaching and illegal wildlife trade, ostensibly due to the administrative emergency situation and rising unemployment created by the nationwide lockdown to contain the spread of the virus (Bhardwaj, 2020; Sen, 2020).

4.1.4 Loss of opportunities for primate research

Restrictions on travel and movement have resulted in the postponement or cancellation of new research projects (Kimbrough, 2020; Pope, 2020), and interrupted data collection for long‐established research programs. In some cases, this has meant leaving habituated primates unattended, which may result in loss of habituation and increased vulnerability to poaching (Williamson & Feistner, 2011). Delays or interruptions in project implementation may result in lost opportunities for students and trainees, and delays or interruptions of even a few months may result in the loss of time‐sensitive data from specific seasons, individuals, or life stages. For long‐term projects dependent on volunteers, students, or field assistants from outside of the local area, shuttering projects, even temporarily, can lead to loss of institutional knowledge and loss of project memory, as international project personnel that were forced to abruptly depart are unlikely to return to train incoming staff when and if the projects are able to resume.

4.2 Opportunities to improve the human–primate interface during and post COVID‐19

4.2.1 Reduced intensity of human–primate interfaces

Global responses to the COVID‐19 pandemic from January to June 2020 have resulted in some shifts to problematic human–primate interfaces as a result of substantial changes in human behavior. As noted above, in many areas, the direct provisioning of primates has been dramatically reduced, and, as a result, wild primates should shift to foraging on other foods to the extent possible, just as they adjust their foraging in response to seasonal and episodic periods of low availability of other preferred foods (Catenaacci, Pessoa, Nogueira‐Filho, & De Vleescchouwer, 2016; Hongo, Nakashima, Akomo‐Okoue, & Mindonga‐Nguelet, 2018; Ning, Guan, Huang, Fan, & Jiang, 2019; Tang et al., 2015). Unfortunately, in many locations, opportunities for researchers to observe these transitions have been limited due to international and domestic travel restrictions, stay‐at‐home orders, and park closures. Nonetheless, there is anecdotal evidence that primates change their behavior when human provisioning ceases. For example, long‐tailed macaques and southern pig‐tailed macaques (Macaca nemestrina ) in Lumut in Perak, Malaysia, which normally rely heavily on handouts from local park visitors, started to forage in nearby mangroves for natural foods, such as molluscs, crabs, and plant foods when the park was closed (N. Ruppert, personal obs. April 2020). The complexity of the problem of habituation to human food, though, is illustrated by the fact that some individuals at this site started crossing the usually busy, but now quiet, road into a nearby housing area to forage in garbage dumps (N. Ruppert, personal obs. April 2020). Similarly, long‐tailed macaques in some public parks in Singapore started to forage more frequently on wild fruiting trees as the closure of car parks reduced visitor presence in the parks (S. Jabbar, personal communication, June 4, 2020). In Shimla in northern India, usually a hotspot for human–macaque conflict, the number of rhesus macaques in the town substantially decreased, presumably because macaque groups moved toward forest areas on the periphery (Bisht, 2020; Phull, 2020). Rhesus macaques and bonnet macaques also disappeared from some temple and tourist sites in India when the pandemic‐fueled lockdown began (Bisht, 2020; Sudhish, 2020).

Primates habituated to humans and human food can become aggressive toward humans (Hsu et al., 2009; Radhakrishna & Sinha, 2011; Zhou & Deng, 1992). In the COVID‐19 era, reduced reliance on provisioning means that human–primate encounters, and the likelihood of human‐directed aggression and potential risk of zoonotic exchange from these encounters, are also reduced. While these may constitute more positive outcomes of the pandemic, it is likely that the resulting changes to the intensity of human–primate interfaces will only be temporary. Unless governments and local communities take action to promote more permanent changes, most of these positive outcomes may quickly be reversed. For example, when the Penang Botanic Garden in Malaysia was reopened on June 6, 2020, there were no signs of anthropogenic food or packaging and all macaques visible from the main trails were foraging on plant foods. However, by the next day, macaques were waiting in the car park, handling food packaging and eating anthropogenic food (S. Lappan, personal obs. June 6, 2020), indicating a return to pre‐lockdown conditions. A rapid return to pre‐lockdown behavior by humans and macaques was also observed in Lumut, Malaysia when the mangrove park reopened (N. Ruppert, personal obs. June 2020), and in Shimla, India when lockdown measures were eased (Sharma, 2020).

4.2.2 Reduced risk of zoonosis due to changes in human risk perception

The pandemic has also affected human perceptions of risk among governments, organizations, and community members in ways that may result in enduring behavior change. The probable zoonotic origins of the SARS‐CoV‐2 virus (Zhang et al., 2020; Zhou et al., 2020), and the hypothesized source of the outbreak at a wet market selling wildlife (Zhou et al., 2020) have been widely reported in the media, which has focused public attention on the dangers that close interactions between humans and wildlife can pose (Walzer, 2020). As a result, there is now broad public support for action to reduce the risk of zoonosis (WWF, 2020), which has led to policy changes such as a temporary ban on the sale of wildlife for human consumption in China (Wescott & Deng, 2020) and the temporary closure of several African National Parks to human visitors to prevent human‐to‐ape transmission of SARS‐CoV‐2 (Bennett, 2020; Vyawahare, 2020b). The government of Gibraltar has also banned all physical contact between humans and Barbary macaques (Macaca sylvanus ), as well as “interference with a natural behavior” (which presumably includes feeding), with the stated goal of preventing human‐to‐primate transmission of SARS‐CoV‐2, but also primate‐to‐human zoonosis of other pathogens (HM Government of Gibraltar, 2020).

Such governmental policies, however, may be ineffective in reducing the risk of zoonosis if they are not matched by behavior change by individuals and communities living in close contact with wild primates. Even communities that are motivated to reduce zoonosis risk may not be adequately informed about the risks involved in different types of human–wildlife interactions, underestimating the risks involved in some activities, such as feeding wild monkeys in a public park or temple, while overestimating the risks from other wildlife encounters. For example, large numbers of bats have been killed in India, Cuba, Rwanda, and Indonesia as a result of community fears about the potential for bat‐to‐human SARS‐CoV‐2 zoonosis (Bittel, 2020), despite the fact that SARS‐CoV‐2 has already become a human virus (Mallapaty, 2020). Increased public awareness about the risks of zoonoses in primate range countries can create negative perceptions about primates among communities living adjacent to wild primates. For example, rhesus and long‐tailed macaques, two primate species that closely interface with humans in many range countries, are the animals of choice for preclinical testing of candidate COVID‐19 vaccines because their lungs express similar ACE2 proteins to humans and their immune responses are also homologous (Bao et al., 2020; Rockx et al., 2020). Local people in Prachuap Khiri Khan, Thailand, who have learned about the susceptibility of these primates to COVID‐19, have started to panic about the risk of zoonotic transmission from monkeys to humans (Siamrath, 2020). In response, the local governor has recommended biosafety protocols for locals that include keeping a distance from monkeys and chasing monkeys away when they invade houses. Primatologists can play a role in these conversations by working closely with local organizations to create accurate messaging about strategies for minimizing the risk of zoonosis.

4.2.3 Opportunities to reduce trade in wildlife

The COVID‐19 pandemic, by focusing public attention on the problem of zoonosis, has changed conversations about biodiversity and human–wildlife interactions in ways that may benefit wild primates and primate habitats. For example, in addition to the temporary ban on trade in wildlife for consumption (Wescott & Deng, 2020), China is reviewing relevant laws (the Wildlife Protection Law of China, the Biosecurity Law, and the Animal Epidemic Prevention Law) to enshrine more permanent legislation to reduce the risk of zoonosis by banning trade in wildlife for human consumption (Vyawahare, 2020a) and reducing the list of animals that can be traded for Traditional Chinese Medicine (Leng & Wan, 2020). While these laws focus on trade in wildlife for human consumption and medicinal use, these changes and similar movements by other governments may also create greater motivation on the part of wildlife authorities to enforce existing laws against trade‐in and keeping of primates as pets.

4.2.4 Research and conservation opportunities

The disruption to “business as usual” due to COVID‐19 has created unprecedented opportunities to better understand, and potentially change, interactions between humans and primates for the better. “Removal experiments,” where an organism is removed from an ecosystem to better understand how it affects other variables in the system, are the gold standard for determining the relationships between ecological variables, but it is generally impossible (and ethically problematic) for researchers to remove humans as an ecological factor to better understand our effects on other animals. Therefore, the dramatic change in human use of these landscapes during government‐mandated closures during, and likely after, the COVID‐19 pandemic represents a potentially fruitful opportunity for researchers interested in understanding the ecological and conservation implications of the human–primate interface.

Researchers may not be able to predict when the closed parks, beaches, temples, and other spaces where primates are routinely fed by humans will re‐open, and the conditions under which this reopening will occur. Nonetheless, it is reasonable to assume that the re‐entry of visitors to some of these spaces may be gradual. Governments may continue to restrict crowd sizes for some time after stay‐at‐home orders are relaxed. Local people may visit parks after movement restrictions are lifted, but many are likely to be preoccupied with other matters during this tumultuous time. Tourism in primate habitat countries is unlikely to return to the pre‐pandemic baseline any time soon, and ongoing physical distancing practices and urgent economic concerns may also reduce the rates of visitation to some of these spaces by local visitors. Therefore, there is likely to be a period of time after formal restrictions are lifted when relatively few people are frequenting these spaces. As noted in the specific recommendations below, given the risk of human‐to‐primate transmission of COVID‐19, researchers engaging in new projects must follow appropriate safety protocols both to reduce transmission risks and to model appropriate behaviors for bystanders.

The economic impacts of the COVID‐19 pandemic may reduce the availability of funding for research and conservation in the upcoming months and years, but the pandemic may also shift the priorities of funding agencies toward supporting disease surveillance, epidemiology, and prevention of zoonosis at the human–primate interface, creating new opportunities for research and conservation activities in these areas. Many granting organizations have created new funding opportunities for research related to COVID‐19, including some specifically focusing on wildlife.

4.2.5 Enhanced public receptiveness to education

The pandemic may also create opportunities to use public education and outreach campaigns to change behaviors. As discussed above, the public is increasingly aware of the potential risk of zoonoses, which may facilitate behavior change around feeding interactions. In places where feeding interactions have already been disrupted, and the resident primate communities have survived by foraging on other, non‐anthropogenic, food sources, people motivated by compassion for primates that they perceive as hungry may be more open to the argument that provisioning is not necessary, and can be harmful. In particular, enhanced awareness of the risk of zoonosis may have made communities more receptive to messaging about the parallel risk of human‐to‐primate disease transmission and the risks that feeding creates for primate communities. In addition, during and beyond the pandemic, effective messaging about the risks of zoonosis to pet owners and the community may reduce the appeal of primates to potential buyers and to local residents who are considering capturing a primate to keep as a pet.

5 SPECIFIC RECOMMENDATIONS

To address the challenges and take advantage of the opportunities described above, we enumerate recommendations for primatologists and other interested parties below.

5.1 Recommendations for immediate implementation

• 1.

  Adopt stringent biosafety protocols to reduce the risk of zoonoses between humans and primates, and especially human‐to‐primate SARS‐CoV‐2 zoonosis, in field and captive settings . Best practice guides from the IUCN (Gilardi et al., 2015; Macfie & Williamson, 2010) provide protocols for reducing the risk of zoonosis between humans and wild great apes. We recommend that researchers working with all primate species adhere to these guidelines, with a modification in the context of SARS‐CoV‐2. The best practice guide recommends a 7‐day quarantine after the resolution of symptoms of infectious disease or after travel from outside of the area (Gilardi et al., 2015). However, given the long incubation period and high probability of asymptomatic infection with SARS‐CoV‐2, we recommend a 14‐day quarantine, following the recommendations of the World Health Organization (WHO, 2020) and the USA Center for Disease Control (CDC, 2020). Individuals infected with SARS‐CoV‐2 and their close contacts should not visit sites with primates until their negative infection status has been verified.

• 2.

  Model safe and appropriate practices with primates in field settings, outreach, and social media materials . Primatologists and conservationists must follow safe distance and masking protocols when being observed or photographed. They should not be photographed holding primates (even in captive care settings) and should avoid sharing images showing close human–primate spacing in outreach materials, on social media accounts, or in public presentations. Such images may create public perceptions that primates are appealing and tame, increasing the risks of inappropriate behavior toward wild primates, and increasing demand for primates as pets (Ross, Vreeman, & Lonsdorf, 2011).

• 3.

  Collect time‐sensitive data on human–primate interfaces as movement controls in range countries are lifted . Researchers who are positioned to visit areas where wild primates are routinely fed should act quickly to record the responses of primates to human re‐entry into these spaces when restrictions on movement are lifted, especially at sites where baseline data from earlier time periods are available. Researchers holding research permissions or funding and those positioned to conduct observational research during the opening period should collaborate to facilitate the rapid initiation of field projects. Specific topics of interest include primate feeding ecology, demography, population dynamics, ranging, and health, as well as human behavior as shared spaces reopen. Studies comparing sites where provisioning continued throughout the lockdown and those where it did not may be particularly fruitful, so collaboration across research groups using standardized research protocols should be considered.

• 4.

  Minimize provisioning or capture of free‐ranging primates . Non‐essential provisioning and capture should be avoided during the pandemic. In cases where provisioning or capture is essential (e.g., rehabilitant animals cannot be allowed to starve, and animals may need to be captured for veterinary care or disease surveillance), contact should be minimized and appropriate biosafety protocols should be followed. Where animals are fed, particularly stringent protocols should be put into place to minimize habituation to human observers and the risk of zoonosis.

• 5.

  Funding agencies (including governmental and nongovernmental organizations) should prioritize funding for research on human–primate interfaces in the pandemic and post‐pandemic period .

5.2 Recommendations for actions to be initiated in the near term

• 1.

  Collaborate with local stakeholders, including governmental and nongovernmental organizations, to develop and implement education programs to reduce provisioning, the keeping of primates as pets, and other practices that create risks of zoonosis between humans and primates . Communities around the globe have already been primed with messaging about the importance of hand and respiratory hygiene, and physical distancing in human social interactions. Conservationists can build on and extend local public health messaging during this crucial period. Specific topics for education programs could include the negative consequences of provisioning, harms caused by the primate pet trade, and the ecological importance of primates and forest habitats.

• 2.

  Establish health monitoring protocols for all habituated primate groups in collaboration with veterinarians, epidemiologists, and public health authorities . The IUCN (Gilardi et al., 2015) provides guidelines for monitoring primate health.

• 3.

  Partner with protected area (PA) and park management to develop educational materials for PA visitors to educate them about appropriate biosafety protocols during visits to parks with resident primate populations .

• 4.

  Provide accurate and accessible information about primates to communities at the human–primate interface to prevent the development of negative attitudes toward primates and other wildlife .

6 CONCLUSION

The COVID‐19 pandemic has caused tremendous suffering and continues to pose a grave threat to humans, primates, and other animals. At the same time, it has created opportunities for interventions to address long‐standing problems at human–primate interfaces. In this commentary, we have identified concrete steps that primatologists can take to support local communities at human–primate interfaces in their efforts to reduce contact, aggression, and the risk of zoonosis between humans and primates. We have also identified opportunities that primatologists should seize to improve our understanding of human–primate interfaces in light of the pandemic, as well as steps that primatologists should take to reduce potential bidirectional exposures to pathogens in a research context (Figure 1). Many widespread practices that increase our exposure to emerging pathogens, such as human encroachment into forested landscapes (Cunningham et al., 2017; Johnson et al., 2020) and legal and illegal trade in animals (Karesh, Cook, Bennett, & Newcomb, 2005; Morse et al., 2012) also threaten wild primate populations and create human–primate conflict. Ultimately, reducing the risk of zoonotic emerging infectious diseases and promoting the well‐being of humans and primates at our interfaces will require additional substantial changes from “business as usual.” The onus is on primatologists to help lead the way.

Flow diagram showing the relationships between recommended actions and intended outcomes. Actions involving working with local partners to effect change through communication and education in communities at human–primate interfaces are lightly shaded. Actions affecting the practice of field research are unshaded. Actions by funders are dark shaded

ACKNOWLEDGMENTS

SL and NR thank the Department of Wildlife and National Parks of Peninsular Malaysia (PERHILITAN) and Forestry Department of Peninsular Malaysia for permission to conduct primatological research in Malaysia. We especially thank Malaysian Primatological Society for extensive logistical and technical support and Aini Hasanah, Priscillia Miard, Joleen Yap, and Zaki Zainol for many helpful conversations about how to reduce human provisioning of primates in Malaysia. NR and SL thank USM (RU/PBIOLOGI/8011063) and Disney Conservation Fund (awarded through Malaysian Primatological Society) for funding research on and conservation of Malaysian primates. SL thanks the USA Fulbright Scholar Program and Appalachian State University for funding support to conduct research in Malaysia. NR thanks the Ministry of Higher Education (FRGS/PBIOLOGI/6711649), the Rufford Foundation, and The Habitat Foundation for funding support to study macaques. SM thanks the Thailand Research Fund Senior Scholar Grant RTA 6280010 and the Thailand Research Fund‐Chinese Academy of Science (TRF‐CAS) Grant DBG60 for funding supports. SR thanks the Department of Science and Technology, Government of India (Grant Order SERB/F/I0032/2016‐17) for funding support and the Forest Department of Himachal Pradesh for logistical support. ER thanks the Indonesian Ministry of Research and Technology (RISTEK) for permission to conduct research in Indonesia, Hasanuddin University for sponsoring her research, staff, and administration at Bantimurung Bulusaraung National Park for field assistance and logistical support, and the American Institute for Indonesian Studies, Wenner Gren Foundation, and San Diego State University for funding. Thanks to Rahayu Oktaviani, Muhammad Iqbal, Sabrina Jabbar, and Thad Q. Bartlett for sharing their observations of primate provisioning. We thank Brenda McCowan and her team, namely Bidisha Chakraborty, Emily Dura, Josephine Hubbard, Krishna Balasubramaniam, Nalina Aiempichitkijkarn and Stefano Kaburu, for many helpful comments that substantially improved the manuscript.

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