Red-billed oxpecker (Buphagus erythrorynchus) on white rhino (Ceratotherium simum), Zimanga game reserve, South Africa

Mouse-ear chickweed (field chickweed) (Cerastium strictum) (Cerastium arvense), Cottonwood Pass, Collegiate Peaks Wilderness, Gunnison National Forest, Colorado, United States of America, North America

Adult male Polar Bears (Ursus maritimus) in ritualistic fighting stance (injuries are rare) near Churchill, Manitoba, Canada.

Adult male Polar Bears, Ursus maritimus, in ritualistic fighting (this almost never leads to serious injury) near Churchill, northern Manitoba, Hudson Bay, Canada

Adult male Polar Bears (Ursus maritimus) in ritualistic fighting stance (injuries are rare) near Churchill, Manitoba, Canada.

Adult male Polar Bears (Ursus maritimus) in ritualistic fighting stance (injuries are rare) near Churchill, Manitoba, Canada.

Dog, Santorini, Greece

Zebras in East Africa, Africa

Portrait of sled dog, floppy ears, Yukon Territory, Canada

Easter lamb, sheep (Ovis orientalis Aries)

White-headed marmoset, Tufted-ear marmoset or Geoffrey's marmoset (Callithrix geoffroyi), adult, tree, captive, Germany, Europe

Close-up portrait of an Oryx (Oryx gazella) or Gemsbok, Kalahari National Park, South Africa

White-tailed deer (Odocoileus virginianus) fawn in the Cascade Siskiyou National Monument, Ashland, Oregon, United States of America

Hartmann's mountain zebra (Equus zebra hartmannae) staring at the camera while standing in the shade under some trees at the Gabus Game Ranch at sunset; Otavi, Otjozondjupa, Namibia

Portrait of male sable antelope (Hippotragus niger) standing in profile at the Gabus Game Ranch at sunset; Otavi, Otjozondjupa, Namibia

Close-up of two diary cows in an alpine meadow with snow-capped mountains in the background, San Candido, Bolzano, Italy

An African elephant (Loxodonta africana) stares at the camera, showing its wrinkled skin, long trunk and left eye and tusk, Ngorongoro Crater, Tanzania

Close-Up Of Shadowed White Rhinoceros (Ceratotherium Simum) Ear, Cabarceno, Cantabria, Spain

USA, Oregon, Wasco, Wheat ears in bright sunshine under blue sky

USA, Oregon, Wasco, Wheat ears in bright sunshine under blue sky