Allens (Lesser) Gallinule, (Porphyrio alleni), Chobe National Park, Botswana

An adult neotropic cormorant (Nannopterum brasilianum), on New River near the Mesoamerican archaeological site of Lamanai, Belize

Adult harlequin duck (Histrionicus histrionicus) in full breeding plumage in the calm waters of Lake Myvatn, Iceland

Adult striated caracara (Phalcoboenus australis) on Carcass Island in the Falkland Islands, South Atlantic Ocean, South America

Adult rockhopper penguin (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island, Falkland Islands

Adult striated caracara (Phalcoboenus australis), close-up, on Carcass Island in the Falkland Islands, South Atlantic Ocean, South America

Adult Imperial Shag (Phalacrocorax (atriceps) atriceps) exhibiting intense breeding plumage, New Island, Falkland Islands

Adult Imperial Shag (Phalacrocorax (atriceps) atriceps) exhibiting intense breeding plumage, New Island, Falkland Islands

Male Great Curassow (Crax rubra) walking on grass, Costa Rica

King penguin (Aptenodytes patagonicus) breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean, Polar Regions

Silkie hen, breed of chicken named for its unique fluffy plumage, Domesticated Fowl, Animal

Secretary bird (Sagittarius serpentarius) spreads wings above tawny eagle (Aquila rapax) in Serengeti National Park, Tanzania

Secretary bird (Sagittarius serpentarius) and tawny eagle (Aquila rapax) with kill in Serengeti National Park, Tanzania

Eurasian spoonbill (Platalea leucorodia) wading in the water, Kiskunsagi National Park, Pusztaszer, Hungary

Greater Sage-grouse (Centrocercus urophasianus); Fort Collins, Colorado, United States of America