Yellow-footed gull (Larus livens), eggs in nest on Isla Coronado, Baja California Sur, Sea of Cortez, Mexico, North America

African pipit (grassland pipit) (grassveld pipit) (Anthus cinnamomeus), Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Eagle Owl, Camargue, France

Starling by San Francisco bay, California, United States of America

A Common Starling, Sturnus vulgaris in Seahouses, Northumberland, UK, moulting from Juvenile to adult plumage.

A Common Starling, Sternus vulgaris in Seahouses, Northumberland, UK.

Close-up portrait of a male willow ptarmigan (Lagopus lagopus) showing early breeding colors in its neck and eye combs, surveying its high-country territory in Southcentral Alaska's Chugach Mountains on an April day. The head and neck will become completely chocolate-brown as the bird's breeding colors develop, Alaska, United States of America

Pair of Burrowing Owls (Athene cunicularia) perched on Cholla cactus (Cylindropuntia) skeleton, Casa Grande, Arizona, United States of America

Burrowing Owl (Athene cunicularia) perched on the ground, Casa Grande, Arizona, United States of America

Martial eagle (Polemaetus bellicosus) eyes camera from leafy bush, Serengeti, Tanzania

Helmeted guineafowl (Numida meleagris) on bank framed by branches; Otavi, Otjozondjupa, Namibia

Burrowing Owl (Athene cunicularia) perched on the ground with head turned to look backwards, Casa Grande, Arizona, United States of America