Danny Green / Japanese cranes (Grus japonensis) displaying in snow, Hokkaido, Japan, February

Danny Green / Japanese crane (Grus japonensis) displaying, wings in heart shape, Hokkaido, Japan, February

Danny Green / Japanese crane (Grus japonensis) displaying, Hokkaido, Japan, February

Krista Schlyer / Whooping crane (Grus americana) International Crane Foundation, Wisconson, USA. Captive.

Markus Varesvuo / Red-crowned Crane (Grus japonensis) in flight, Hokkaido, Japan, February

Markus Varesvuo / Red-crowned Crane (Grus japonensis) preening in snow,Hokkaido, Japan, February

Tim Laman / Red-crowned crane (Grus japonensis) pair in a snowstorm, Hokkaido, Japan. Endangered species.

Ben Cranke,Ben Cranke / Flock of Hooded Cranes (Grus monacha) Kyushu, Japan

Fabrice Cahez / Common crane (Grus grus) standing in line on snow covered lake, Lake du Der, Champagne, France, February.

Fabrice Cahez / Common crane (Grus grus) standing in line on snow covered lake with some flying overhead, Lake du Der, Champagne, France, February.

Rolf Nussbaumer / Whooping Crane (Grus americana) wading in coastal waters, Seadrift, San Antonio Bay, Gulf Intracoastal Waterway, Coastal Bend, Texas Coast, USA

Gerrit Vyn / Adult Whooping Cranes (Grus americana) from the wild population, foraging in a corn field during spring migration. Central South Dakota, USA, April.