Edwin Giesbers / Red river hog (Potamochoerus porcus) close up of head, captive

Bert Willaert / Amplectant pair of Natterjack Toads (Epidalea / Bufo calamita) with reflection in water. Belgium, Europe, July.

Tony Heald / African elephant (Loxodonta africana) at waterhole with Giraffe in the background, Etosha National Park, Namibia, August

Ernie Janes / Suffolk Punch heavy horse in field resting head another's back, UK, September

Ernie Janes / Basset hound, portrait, resting head on back of car, eyes half closed, UK

Alex Mustard / An adult female California sea lion (Zalophus californianus) head portrait, in a rocky underwater cave. La Paz, Baja California Mexico. Sea of Cortez, East Pacific Ocean. October

Claudio Contreras / Northern elephant seal (Mirounga angustirostris) weaner sleeping at the bottom of a tide pool, Guadalupe Island Biosphere Reserve, off the coast of Baja California, Mexico, April

Michael D. Kern / Zoo Atlanta / White-spotted leaf frog (Cochranella albomaculata) captive, from Central America. Please credit Michael Kern / Zoo Atlanta.

Tim Laman / Wallace's flying frog (Rhacophorus nigropalmatus) on a tree trunk in the lowland rainforest, Danum Valley Conservation Area, Sabah, Borneo, Malaysia.

Neil Lucas / Weddell seal {Leptonychotes weddellii} mother with pup on ice, pup yawning, Antarctica

Sue Daly / Large group of Sunflower sea stars (Asterias / Pycnopodia helianthoides) covering rock, pacific coast, Canada, August

Edwin Giesbers / Close up face portrait of male Orang Utan (Pongo pygmaeus) Captive, Netherlands