Loic Poidevin / Impala (Aepyceros melampus) male, standing in grassland, Uganda.

Loic Poidevin / Topi (Damaliscus lunatus) head portrait, Uganda.

Loic Poidevin / Kob (Kobus kob) male, standing in long grass, Uganda.

Loic Poidevin / Kob (Kobus kob) male, standing in grassland, Uganda.

Loic Poidevin / Impala (Aepyceros melampus) male, standing in grassland with calf, Uganda.

Loic Poidevin / Impala (Aepyceros melampus) male, standing in grassland with calf, Uganda.

Loic Poidevin / Two Impalas (Aepyceros melampus) female, standing at edge of woodland, portrait, Uganda.

Loic Poidevin / Iberian lynx (Lynx pardinus) portrait, Spain. November. Endangered.

Loic Poidevin / Iberian lynx (Lynx pardinus) resting on grass, Spain. November. Endangered.

Loic Poidevin / Iberian lynx (Lynx pardinus) wearing radio collar, walking over grassland, Spain. November. Endangered.

Loic Poidevin / Iberian lynx (Lynx pardinus) wearing radio collar, sitting in grassland, Spain. October. Endangered.

Loic Poidevin / Vervet (Chlorocebus pygerythrus) sitting among trees scratching its foot, Uganda.

Loic Poidevin / Banded mongoose (Mungos mungo) walking over grass, Uganda.

Loic Poidevin / Olive baboons (Papio anubis) pair with infant, huddling together in savanna grassland, Uganda.

Loic Poidevin / Olive baboons (Papio anubis) pair with infant, huddling together in savanna grassland, Uganda.

Loic Poidevin / Olive baboons (Papio anubis) pair with infant, huddling together in savanna grassland, Uganda.

Loic Poidevin / Olive baboons (Papio anubis) pair with infant, sitting side by side in savanna grassland, Uganda.

Loic Poidevin / Olive baboons (Papio anubis) pair with infant, sitting side by side in savanna grassland, Uganda.

Loic Poidevin / Olive baboons (Papio anubis) pair with infant, sitting side by side in savanna grassland, Uganda.

Loic Poidevin / Olive baboons (Papio anubis) pair with infant, in savanna grassland, Uganda.

Loic Poidevin / Blue monkey (Cercopithecus mitis albogularis) sitting on tree branch, Uganda.

Loic Poidevin / Olive baboon (Papio anubis) sitting next to termite mound, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) sitting high up in tree top, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) sitting on grass feeding on leaves, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) grabbing plant stem and feeding on leaves, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) sitting cuddling infant, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) sitting in tree, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) sitting in tree looking down, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) climbing on tree branch in forest, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) sitting on tree branch with infant clinging on, Uganda.

Loic Poidevin / Blue monkey (Cercopithecus mitis) chewing on water tap, Uganda.

Loic Poidevin / Blue monkey (Cercopithecus mitis) sitting in tree, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) sitting in tree, Uganda.

Loic Poidevin / Blue monkey (Cercopithecus mitis) portrait, Uganda.

Loic Poidevin / Blue monkey (Cercopithecus mitis) with juvenile, sitting in tree, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) sitting in tree, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) with mouth open sitting in tree, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) with mouth open sitting in tree, Uganda.

Loic Poidevin / Vervet (Chlorocebus pygerythrus) sitting on tree stump eating fruit, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) sitting in tree, Uganda.

Loic Poidevin / Ugandan red colobus (Piliocolobus tephrosceles) with infant sitting in tree, gripping onto branch, Uganda.

Loic Poidevin / Two Vervets (Chlorocebus pygerythrus) one grooming the other, Uganda.

Loic Poidevin / Blue monkey (Cercopithecus mitis) head portrait, Uganda.

Loic Poidevin / Two Chimpanzees (Pan troglodytes) one grooming the other, Uganda. Endangered.

Loic Poidevin / Two Chimpanzees (Pan troglodytes) one grooming the other, Uganda. Endangered.

Loic Poidevin / Olive baboon (Papio anubis) sitting on ground chewing on grass stem, Uganda.

Loic Poidevin / Waterbuck (Kobus ellipsiprymnus) male, standing at water's edge, Uganda.

Loic Poidevin / Impala (Aepyceros melampus) camouflaged in long grass, Uganda.

Loic Poidevin / Topi (Damaliscus lunatus) female with calf grazing on grassland, Uganda.

Loic Poidevin / Topi (Damaliscus lunatus) herd of females with a calf in grassland, Uganda.

Loic Poidevin / Impala (Aepyceros melampus) female suckling calf in grassland, Uganda.

Loic Poidevin / Impala (Aepyceros melampus) female with calf in grassland, Uganda.

Doug Wechsler / Woodchuck (Marmota monax) feeding on an acorn from White oak (Quercus alba) tree, Morris Arboretum, Pennsylvania, USA. October.

Philippe Clement / Brown bear (Ursus arctos) climbing up tree in deciduous forest, Germany. Captive.

Philippe Clement / Tasmanian devil (Sarcophilus harrisii) portrait. Captive, occurs in Australia. Endangered.

Philippe Clement / Tasmanian devil (Sarcophilus harrisii) standing on log in forest. Captive, occurs in Australia. Endangered.

Philippe Clement / Ring-tailed lemur (Lemur catta) head portrait. Captive, occurs in Madagascar, Endangered.

Philippe Clement / Yellow-breasted capuchin (Sapajus xanthosternos) carrying piece of wood to use as tool for crushing food. Captive, occurs in Brazil. Critically endangered.

Philippe Clement / Sand cat (Felis margarita) walking over sandy ground. Captive, occurs in North Africa, the Arabian Peninsula, Pakistan and the Middle East.

Philippe Clement / Sand cat (Felis margarita) portrait. Captive, occurs in North Africa, the Arabian Peninsula, Pakistan and the Middle East.

Philippe Clement / Persian leopard / Caucasian leopard (Panthera pardus saxicolor) fur markings detail. Captive, occurs in central Asia. Endangered.

Fernando Faciole / Ranger tracking family of Mountain gorillas (Gorilla beringei beringei) for habituation process, using their droppings. Bwindi Impenetrable Forest, Kanungu District, Uganda.

Fernando Faciole / Silverback Mountain gorilla (Gorilla beringei beringei) sitting on forest floor, part of group previously habituated to humans. Bwindi Impenetrable Forest, Kanungu District, Uganda.

Fernando Faciole / Chimpanzee (Pan troglodytes) sitting on forest floor, spotted while tracking different group. Kibale National Park, Uganda.

Fernando Faciole / Juvenile Mountain gorilla (Gorilla beringei beringei) resting in tree, part of group in habituation process. Bwindi Impenetrable Forest, Kanungu District, Uganda.

Fernando Faciole / Mountain gorilla (Gorilla beringei beringei) feeding on branch, part of group previously habituated to humans. Bwindi Impenetrable Forest, Kanungu District, Uganda.

Fernando Faciole / Rangers tracking family of Mountain gorillas (Gorilla beringei beringei) for habituation process, holding hair from silverback male found inside biggest nest. Bwindi Impenetrable Forest, Kanungu Dis...

Fernando Faciole / Six-banded armadillo (Euphractus sexcinctus) standing on hind legs, sniffing air. Transpantaneira Highway, Pocone, Mato Grosso, Brazil.

Fernando Faciole / Southern tamandua (Tamandua tetradactyla) searching for insects inside termite mound. Transpantaneira Highway, Pocone, Mato Grosso, Brazil.

Fernando Faciole / Southern tamandua (Tamandua tetradactyla) searching for insects inside termite mound. Transpantaneira Highway, Pocone, Mato Grosso, Brazil.

Fernando Faciole / Southern tamandua (Tamandua tetradactyla) searching for insects beneath tree bark. Transpantaneira Highway, Pocone, Mato Grosso, Brazil.

Fernando Faciole / Southern tamandua (Tamandua tetradactyla) walking through Pantanal wetlands. Transpantaneira Highway, Pocone, Mato Grosso, Brazil.

Fernando Faciole / Red caiman (Caiman yacare) head portrait. Transpantaneira Highway, Mato Grosso, Brazil.

Fernando Faciole / Crab-eating fox (Cerdocyon thous) walking through Pantanal wetlands. Transpantaneira Highway, Pocone, Mato Grosso, Brazil.

Fernando Faciole / Southern tamandua (Tamandua tetradactyla) run over on Transpantaneira highway, found by NGO, lifeless when reached first aid team. Pantanal Wetlands, Mato Grosso, Brazil.

Fernando Faciole / Marsh deer (Blastocerus dichotomus) standing in first rays of morning sun. Pantanal Wetlands, Mato Grosso, Brazil.

Fernando Faciole / Marsh deer (Blastocerus dichotomus) standing in first rays of morning sun. Pantanal Wetlands, Mato Grosso, Brazil.

Fernando Faciole / Collared peccary (Pecari tajacu) orphaned infant, rescued on Transpantaneira highway, found in house after fleeing fires, being bottle fed. Pantanal Wetlands, Mato Grosso, Brazil.

Fernando Faciole / Tayra (Eira barbara) hit by car on Transpantaneira highway, still alive but with severe injuries. Pantanal Wetlands, Mato Grosso, Brazil.

Fernando Faciole / Crab-eating fox (Cerdocyon thous) resting, Transpantaneira Highway, Pantanal, Mato Grosso, Brazil.

Fernando Faciole / Nine-banded armadillo (Dasypus novemcinctus) standing on its hind legs in Pantanal wetlands. Transpantaneira Highway, Mato Grosso, Brazil.

Fernando Faciole / Giant river otter (Pteronura brasiliensis) alert, on banks of Pantanal wetlands. Barao de Melgaco, Mato Grosso, Brazil.

Fernando Faciole / Jaguar (Panthera onca) walking through Pantanal wetlands. Encontro das Aguas State Park, Mato Grosso, Brazil.

Fernando Faciole / Jaguar (Panthera onca) walking through Pantanal wetlands. Encontro das Aguas State Park, Mato Grosso, Brazil.

Fernando Faciole / Six-banded armadillo (Euphractus sexcinctus) hiding in grassland of Pantanal wetlands. Transpantaneira Highway, Pocone, Mato Grosso, Brazil.

Fernando Faciole / Two wild Reindeer (Rangifer tarandus) crossing windswept valley in autumn. North Iceland. October.

Fernando Faciole / Harbour seal (Phoca vitulina) swimming across bay. Hunafloi Bay, Strandir. Iceland. October.

Fernando Faciole / Harbour seals (Phoca vitulina) resting on sandbar at dusk. Hunafloi Bay, Strandir, Iceland. October.

Fernando Faciole / Three wild Reindeer (Rangifer tarandus) crossing windswept valley in autumn. North Iceland. October.

Fernando Faciole / Three wild Reindeer (Rangifer tarandus) crossing windswept valley in autumn. North Iceland. October.

Fernando Faciole / Western pygmy marmoset (Cebuella pygmaea) resting on tree branch, looking up. Yasuni National Park, Napo, Ecuador.

Fernando Faciole / Claws of Brown-throated sloth (Bradypus variegatus) climbing tree after getting to ground to urinate or defecate. Corcovado National Park, Osa Peninsula, Costa Rica.

Fernando Faciole / Northern tamandua (Tamandua mexicana) climbing tree. Corcovado National Park, Osa Peninsula, Costa Rica.

Fernando Faciole / Striped hog-nosed skunk (Conepatus semistriatus) on steps of building. Corcovado National Park, Osa Peninsula, Costa Rica.

Fernando Faciole / White-nosed coati (Nasua narica) on tree branch, looking down. Corcovado National Park, Osa Peninsula, Costa Rica.

Fernando Faciole / Panamanian white-faced capuchin (Cebus imitator) juvenile, feeding on part of coconut. Corcovado National Park, Osa Peninsula, Costa Rica.