Eric Baccega / Polar bear cub 3 months (Ursus maritimus) playing in the front of the day den in march. Wapusk National Park. Churchill, Manitoba, Canada

Eric Baccega / Polar bear (Ursus maritimus) female coming out the den with one three month cub. Wapusk National Park, Churchill, Manitoba, Canada, March.

Tim Laman / Male Club-winged Manakin (Machaeropterus deliciosus) hitting his wings (stridulating) together over his back to attract mate, Endemic, Milpe Cloudforest Reserve, Ecuador, January.

Mark Taylor / Ginger kitten leaping towards a Pug puppy. Digital composite.

Chris & Monique Fallows / Common dolphin (Dephinus delphis) pod feeding on sardines (Sardinops oecllata) East London, South Africa.

Chris & Monique Fallows / African penguins (Spheniscus demersus) diving underwater, False Bay, Cape Town, South Africa.

Chris & Monique Fallows / African penguins (spheniscus demersus) swimming underwater, False Bay, Cape Town, South Africa.

Richard Du Toit / Leopard (Panthera pardus) and cub, Kgalagadi Transfrontier Park, Botswana

Claudio Contreras / Northern mockingbird (Mimus polyglottos) in courtship display, San Quintin, Baja California Peninsula, Mexico,

Claudio Contreras / Northern mockingbird (Mimus polyglottos) in courtship display, San Quintin, Baja California Peninsula, Mexico,

Tim Laman / Cobalt-winged Parakeets (Brotogeris cyanoptera) eating clay at clay lick east of Anangu and south of the Napo River, Yasuni National Park, Orellana Province, Ecuador, July.