Markus Varesvuo / Red-crowned Cranes (Grus japonensis) displaying and calling in snow, Hokkaido, Japan, February

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 / Two Red-crowned cranes (Grus japonensis) in flight in snow, Japan.

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

David Tipling / Red-crowned Cranes (Grus japonensis) displaying at dawn Hokkaido, Japan, February. Did you know? Red crowned cranes mate for life.

David Tipling / People watching flock of Japanese / Red crowned cranes {Grus japonensis} Akan, Hokkaido, Japan, February 2008

Kerstin Hinze / Japanese / Red-crowned crane (Grus japonensis) pair displaying, calling, in snow, Tsurui, Kushiro-Shitsugen National Park, Hokkaido, Japan

Konrad Wothe / Red-crowned Crane (Grus japonensis) pair foraging in snow, Hokkaido, Japan

Konrad Wothe / Red-crowned Crane (Grus japonensis) pair calling and jumping during courtship, Hokkaido, Japan

Konrad Wothe / Red-crowned Crane (Grus japonensis) pair calling during courtship dance at their wintering grounds, Hokkaido, Japan

Konrad Wothe / Red-crowned Crane (Grus japonensis) flock feeding in snow, Tsurui Ito Sanctuary, Japan