Juergen & Christine Sohns / Minden / Leopard (Panthera pardus), Sabi-sands Game Reserve, South Africa
Neil Challis / Long-tailed macaque (Macaca fascicularis) female suckling and grooming infants on a branch, Central Thailand, December.
Neil Challis / Close up of Long-tailed macaque (Macaca fascicularis) male sleeping in a tree, Central Thailand, June.
Neil Challis / Mudskipper (Periophthalmus) displaying with pectoral fin at the entrance to its hole, Southern Thailand, March.
Matthew Maran / Red fox (Vulpes vulpes) walking through Highgate Cemetery Mausoleum at night, London, UK. August.
Solvin Zankl / Cock-eyed squid (Histioteuthis bonnellii) swimming in the darkness, Benguela Current, Atlantic Ocean, close to Namibia. Found at depths of over 1,000 meters. Controlled Conditions.
Joel Sartore / Photo Ark / Mojave desert sidewinder (Crotalus cerastes) close up, flicking its tongue, Woodland Park Zoo. Captive.
Joel Sartore / Photo Ark / Silvery javan gibbon (Hylobates Moloch) juvenile yawning, Bali Safari, Indonesia. Endangered. Captive.
Joel Sartore / Photo Ark / Horsfield's tarsier (Cephalopachus bancanus) standing up and vocalising, Taman Safari, Indonesia. Captive.
Joel Sartore / Photo Ark / Horsfield's tarsier (Cephalopachus bancanus) close up of head, moving its ears, Ragunan Zoo, Indonesia. Captive.
Joel Sartore / Photo Ark / Silvery javan gibbon (Hylobates moloch) juvenile sitting, curled up on the floor, Bali Safari, Indonesia. Endangered. Captive.
Joel Sartore / Photo Ark / Common marmoset (Callithrix jacchus) female with a baby holding onto her back, University of Nebraska, Omaha. Captive.
Joel Sartore / Photo Ark / Least bittern (Ixobrychus exilis) juvenile raising head up, Wildlife Rehabilitation Center, Roseville. Captive.
Joel Sartore / Photo Ark / Red-crested turaco (Tauraco erythrolophus) looking around and raising crest, Tracy Aviary. Captive.
Joel Sartore / Photo Ark / Painted stork (Mycteria leucocephala) snapping towards the camera, Tracy Aviary. Captive.
Joel Sartore / Photo Ark / Two African crowned cranes (Balearica regulorum regulorum) looking around, then one ruffles its feathers, Lincoln Children's Zoo. Captive.
Joel Sartore / Photo Ark / Great green macaw (Ara ambiguus) turning its head and moving tongue, Tracy Aviary. Captive.
Vishal Jadhav / Indian jackal (Canis aureus indicus) female grooming male's head, Maharashtra, India, September.
Vishal Jadhav / Spotted owlet (Athene brama) female looking out of nest in rocks, males appears then flies off, Maharashtra, India, January.
Lewis Jefferies / Red squirrel (Sciurus vulgaris) feeding on the ground in the Cairngorms National Park, Scotland, UK, June.
Bruce Thomson / Crucifix toad / Holy cross frog (Notaden bennetti) sitting in shallow water after heavy summer rain, Westmar, Queensland, Australia.
Joel Sartore / Photo Ark / Screaming hairy armadillo (Chaetophractus vellerosus) sniffing while looking at camera before approaching it, Parque de Las Leyendas in Lima, Peru. Captive.
Joel Sartore / Photo Ark / African wood owl (Strix woodfordii) looking around and towards camera, Monticello Cente, Monticello Grosseto. Captive.
Joel Sartore / Photo Ark / Mentanani scops owl (Otus mantananensis rombloni) juvenile looking towards camera, Semirara Island Aviary. Captive.
Joel Sartore / Photo Ark / Common Bay Owl (Phodilus badius) looking around, Penang Bird Park, Seberang Perai, Pulau Pinang. Captive.
David Tipling / Roe deer (Capreolus capreolus) doe with fawns in stubble field after harvest, mid summer, North Norfolk, UK. July.
Jack Dykinga / Female Burrowing owl (Athene cunicularia) with two chicks in farm fields, near Marana, Arizona, USA.
Klein & Hubert / Cape buffalo (Syncerus caffer) with Yellow-billed oxpckers (Buphagus africanus) drinking at waterhole in dry season, South Luangwa National Park, Zambia, Africa.
Danny Green / Barn owls (Tyto alba) perched on tree branch, late evening. Northamptonshire, UK, May.
Danny Green / European badger (Meles meles) in woodland in late evening light. Scotland, UK, August.
Danny Green / Long tailed tit (Aegithalos caudatus) perched on hawthorn. Hampshire, UK, May.
Richard Hopkins / Female European otter (Lutra lutra) looking directly at camera as her male cub suckles before she turns away from him; he pesters her to feed him again. Shetland, UK, September.
David Fleetham / Endangered Green sea turtle (Chelonia mydas) stretches neck to be cleaned by Yellow tangs (Zebrasoma flavescens) and Goldring tangs (Ctenochaetus strigosus), North Pacific, Hawaii, USA.
Pal Hermansen / Pygmy owl (Glaucidium passerinum) looking directly at camera as it peers out of nest hole in dead tree trunk, Viken, Norway.
Tony Wu / Japanese dwarf flying squirrel (Pteromys volans orii) gliding through snowy forest, Hokkaido, Japan.
Solvin Zankl / Scaleless black dragonfish (Melanostomias biseriatus) appearing out of the darkness and swimming towards the camera, Atlantic Ocean close to Cape Verde.
Solvin Zankl / Portrait of Scaleless black dragonfish (Melanostomias biseriatus), Atlantic Ocean close to Cape Verde.
Doug Gimesy / Portrait of Emu (Dromaius novaehollandiae).
Kangaroo Island, South Australia, Australia.
Richard Du Toit / Yellow mongoose (Cynictis penicillata) resting, Kgalagadi Transfrontier Park, Northern Cape Province, South Africa.
Pal Hermansen / Portrait of a Sparrowhawk (Accipiter nisus), Telemark, Norway.
Pal Hermansen / Close up of a Emperor penguin (Aptenodytes forsteri) face looking around and towards camera, Snow Hill Island, Antarctica, October.
Charlie Summers / Black-footed ferret (Mustela nigripes) on Black-tailed prairie dog (Cynomys ludovicianus) mound, in snow. A reintroduction programme is underway with approximately 300 individuals of this critically e...
Andy Murch / Smooth hammerhead shark (Sphyrna zygaena). Cabo San Lucas, Baja California Sur, Mexico.