Cyril Ruoso / Bonobo (Pan paniscus) juvenile pair making funny faces, Democratic Republic of the Congo

Bence Mate / Head portrait of Dalmatian pelican (Pelecanus crispus) with pouched bill wide open. Danube Delta, Romania

Edwin Giesbers / Konik Wild Horse (Equus ferus caballus) yawning. The Netherlands, November.

Ernie Janes / Asiatic wild ass (Equus hemionus) with foal, captive, UK, endangered species

Andrew Walmsley / Mini lop-eared domestic rabbit with one ear up and one ear down, and tongue sticking out, Captive, Christchurch, New Zealand

Michael D. Kern / Zoo Atlanta / Lemur leaf frog (Hylomantis lemur) mating pair, captive, Critically endangered, from Central America

Stephen Dalton / Henkel's leaf tailed gecko (Uroplatus henkeli) licking its eye with its tongue, controlled conditions

Steven Kazlowski / Polar bear (Ursus maritimus) sow plays with her spring cub outside their den in late winter, Alaska

Anup Shah / Young male Chimpanzee 'Gold' 3-years-3-months-old, watches mother 'Gremlin' use stick as tool to catch termites {Pan troglodytes schweinfurtheii} Gombe NP, Tanzania. 2002

TJ Rich / Male silverback Western lowland gorilla feeding {Gorilla gorilla gorilla} UK

TJ Rich / Young European rabbit {Oryctolagus cuniculus} head on portrait, Hampshire, England, UK

Claudio Contreras / Balloonfish (Diodon holocanthus), Cabo Pulmo National Park, Sea of Cortez (Gulf of California), Mexico, July