Polar bear (Ursus maritimus) cubs looking out of the den, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) cub looking out of den, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Horse peers out of a horsebox, United Kingdom, Europe

Young leopard (Panthera pardus) peering out from a tree, South Luangwa National Park, Zambia, Africa

King penguin (Aptenodytes patagonicus) chick peering out between several adults, Volunteer Point, Falkland Islands, South America

Zanzibar Red Colobus monkey, one of Africa's rarest primates

European Souslik (Spermophylus citellus) head peering out of burrow amongst vegetation, Bulgaria

European Souslik (Spermophylus citellus) peering out from burrow, Bulgaria

Magellanic penguin (spheniscus magellanicus) peering out from burrow, new island, falkland islands.

European Souslik (Spermophylus citellus) peering out from entrance to burrow, Bulgaria

Eider duck (Somateria mollissima), male. Eider male peering out from in the middle of a winter raft. Various preening, calling and fighting in background.

Gray Mouse Lemur (Microcebus murinus), adult peering out of a hole in a tree, Perinet Game Reserve, Madagascar, Africa

Toddler boy peers out of dark hole in Redwood Tree trunk, Redwood National Park, California.

Kitten Peeking Through Barn Doors, Steinbach, Manitoba, Canada

Close-up portrait of a Canada Lynx (Lynx canadensis) resting in the shadows of a Southcentral Alaska alder thicket. Lynx populations are closely linked to booms and busts in the numbers of their main prey the snowshoe hare, Alaska, United States of America

Close-up portrait of a Canada Lynx (Lynx canadensis) looking at the camera through the branches of a Southcentral Alaska alder thicket. Lynx populations are closely linked to booms and busts in the numbers of their main prey the snowshoe hare, Alaska, United States of America

Sitka deer fawn (Odocoileus hemionus sitkensis) peering out from the green foliage, Tongass National Forest; Alaska, United States of America

A young woman poses while peering out from behind a rusty weathered drum, South naknek bristol bay alaska united states of america

Glacier bear (Ursus americanus emmonsii) peering out from the tall grass, Tongass National Forest; Alaska, United States of America

Glacier bear (Ursus americanus emmonsii) peering out from the tall grass, Tongass National Forest; Alaska, United States of America

Mother and daughter looking out a playhouse window, Alberta, Canada

Bhutan, Thimpu Dzong, Atsara, or comedian peering out from behind a curtain at a masked dance Tsecchu.