New England Primate Conservancy

Central African pottos (Perodicticus edwardsi), also called Milne-Edwards's pottos, are native to Central Africa. Mostly solitary, they engage in some social interactions. Widespread and adaptable, they face no major threats. Photo: © Perrine Théroude/iNaturalist/Creative Commons.

Black-footed gray langurs (Semnopithecus hypoleucos), also called Malabar sacred langurs, are endemic to the Western Ghats. Like all langurs, nature has graced them with sacculated stomachs to digest their cellulose-rich leafy diet. Threatened by forest degradation and hunting. Least Concern.

Moor macaques (Macaca maura) are one of 7 macaque species endemic to Sulawesi. Primarily fruit-eaters, they forage in trees and travel on land. Threatened by habitat disturbances, the pet trade, and human-wildlife conflicts that arise from the monkeys raiding farmers' crops. Listed as Endangered.

Yucatan black howlers (Alouatta pigra) are native to Belize, Guatemala, and Mexico. The largest howler monkeys and loudest land animals. Morning and evening howling sessions can last for over an hour. Threatened by deforestation, climate change, hunting, and trapping. Endangered.

Arunachal macaques (Macaca munzala) were described in 2005. Known to occur only in Arunachal Pradesh. More than 75% of their population lives in human-modified landscapes. Fewer than 250 mature individuals exist. Endangered. Photo: © Kripaljyoti Mazumdar/iNaturalist/Creative Commons.

Groves' dwarf lemurs (Cheirogaleus grovesi) are restricted to Madagascar’s Ranomafana and Andringitra National Parks. Known to occupy montane rainforests. The full extent of their range remains unknown. Data Deficient, there is still much to learn. Photo: ©globalherping/iNaturalist/Creative Commons.

Coquerel's sifakas (Propithecus coquereli ) are endemic to the dry forests of NW Madagascar. Named their warning calls for ground predators, shuh-fokk. Long legs propel them up to 35 ft (10.5 m) in a single leap. Threatened by deforestation, habitat fragmentation, and hunting. Critically Endangered.

Mantled howlers (Alouatta palliata) are distributed from southern Mexico through Central America and the Pacific Coasts of Colombia, Ecuador, and Peru. An enlarged hyoid bone in males' throats produces their famous calls. Threatened by habitat loss and fragmentation. Near Threatened.

Philippine tarsiers (Carlito syrichta) are one of the world's smallest primates. Nocturnal and carnivorous, they are built to see, hear, and hunt in darkness. Threatened by habitat loss, hunting, and capture for the pet trade; they typically do not survive captivity. Near Threatened.

Bangka slow lorises (Nycticebus bancanus) are endemic to Borneo and Bangka Island. Forest loss has resulted in less than 20% of their former habitat remaining. Not seen since 1937, they may already be extinct. Photo: ©skeep denny/iNaturalist/Creative Commons. Listed as Critically Endangered.

Assam macaques (Macaca assamensis) span nine countries from Vietnam to Nepal. They inhabit primary forests with low tolerance for disturbed forests. Their matrilineal social structure is based on female family lines. Threatened by habitat loss, hunting, and human-wildlife conflict. Near Threatened.

Juruá red howlers (Alouatta juara) are native to Brazil and Peru. Large leaf-eaters who spend up to 70% of the day resting while fermenting and digesting their leafy diet. Widespread, but under strong pressure from hunting. Photo: © Rafael M. Rabelo/iNaturalist/Creative Commons.

Sunda slow lorises (Nycticebus coucang) are native to parts of Indonesia, Thailand, and Singapore. Threatened by human encroachment and hunting for bushmeat and body parts. Especially threatened by the pet trade, where they rarely survive the stresses of captivity. Listed as Endangered.

White-handed gibbons (Hylobates lar), also called lar gibbons, are native to Indonesia, Laos, Malaysia, Myanmar, and Thailand. Masters of agility who leap 26 feet (8m). Fruit-eaters who disperse seeds as they travel. Threatened by hunting, capture for the pet trade, and habitat loss. Endangered.

Black-crowned dwarf marmosets (Callibella humilis)are endemic to Amazonas, Brazil. An adaptable species, they can often be found near villages and may have developed dependence on fruit orchards and gardens. Listed as Least Concern. Photo: © Royle Safaris/iNaturalist/Creative Commons.

Black-horned capuchins (Sapajus nigritus) are native to Argentina and Brazil. Diet includes a variety of plants, fruits, seeds, arthropods, and small animals. Some live close to corn, banana, sugar cane, and cassava fields. Threatened by habitat loss and persecution as crop pests. Near Threatened.

Southern pygmy lorises (Xanthonycticebus pygmaeus), also called pygmy slow lorises, are native to Cambodia, Lao PDR, and Vietnam. Threatened by hunting and capture for folkloric medicines, the illegal pet trade, and habitat loss. Their exploitation is unsustainable. Listed as Endangered.

King colobuses (Colobus polykomos), also called western black-and-white colobuses, are native to forests of Africa's west coast. They rely on primary forests and struggle to thrive in secondary or degraded forests. Threatened by uncontrolled hunting, forest loss, degradation, and fragmentation.

Peleng tarsiers (Tarsius pelengensis) are found on Peleng Island, off the coast of eastern Sulawesi. Nocturnal and social. Their diet is 100% live animal prey, mostly insects, with some small vertebrates like frogs and lizards. Threatened by habitat loss and restricted range. Listed as Endangered.

Black-faced black spider monkeys (Ateles chamek), also known as Peruvian spider monkeys, are found in Bolivia and Brazil, as well as Peru. Highly frugivorous, fruit accounts for 85% of their diet. Threatened by hunting and habitat loss. Populations have declined by at least half. Endangered.

Northern night monkeys (Aotus trivirgatus ) are found north of the Amazon River, between southern Venezuela and north-central Brazil. Nocturnal. They live in family groups consisting of a mated pair and offspring. Widespread in their range, but threatened by habitat loss. Listed as Least Concern.

Bale monkeys (Chlorocebus djamdjamensis) are endemic to the Ethiopian highlands' Bale Mountains. Habitat specialists who live in bamboo forests. Where agriculture has replaced bamboo forests, they dine on farmers' crops. Threatened by habitat loss, hunting, and human-wildlife conflicts. Vulnerable.

Sanje mangabeys (Cercocebus sanjei) are endemic to the eastern slopes of Tanzania's Udzungwa Mountains. Their fragmented populations occur in two isolated subpopulations and continue to decline. Threatened by deforestation and hunting. Endangered. Photo: ©Stefaneakame/iNaturalist/Creative Commons.

Bengal slow lorises (Nycticebus bengalensis) are native to Southeast Asia. Armed with protective secretions that become toxic when mixed with saliva to deliver a toxic bite. Threatened by the exotic pet trade, hunting for bushmeat and trinkets, and rampant habitat loss. Listed as Endangered.

Oustalet's red colobuses (Piliocolobus oustaleti), also called Oubangui red colobuses, are native to the Central African Republic, Congo, and DR Congo. Found in a variety of mature forests. Threatened by habitat loss and hunting. Photo: © François Sandrin/iNaturalist/Creative Commons. Vulnerable.

Fat-tailed dwarf lemurs (Cheirogaleus medius) are restricted to Madagascar's dry western forests. When food is scarce, they enter long-term torpor, surviving on fat stored in their tails; their hearts beat just 4 times per minute, and they take just 1 breath every 10-15 minutes.

Nepal gray langurs (Semnopithecus schistaceus), also called Central Himalayan langurs, occur in the monsoon forests of Pakistan's North-West Frontier Province, thru the Himalayan elevations of India, Nepal, and Bhutan. Widespread, yet subject to threats from logging, habitat loss, fires, and wars.

White-fronted lemurs (Eulemur albifrons), also called white-fronted brown lemur, white-headed lemur, and white-headed brown lemur, are found throughout most of the remaining rainforest in northeastern Madagascar. Threatened by unsustainable hunting and habitat loss. Listed as Vulnerable.

Southern pig-tailed macaques (Macaca nemestrina) are native to Brunei, Indonesia, Malaysia, and Thailand in a variety of habitats, including agricultural sites. Threatened by habitat loss, human-wildlife conflicts, hunting, and collection for the pet trade and biomedical research. Endangered.

Booted macaques (Macaca ochreata) are endemic to the rainforests of Sulawesi. Farms and plantations overtake their forest habitats, leading these fruit-eaters to rely on cultivated crops and to conflicts with farmers. Listed as Vulnerable. Photo: © fachrynurmallojr/ iNaturalist/Creative Commons./