Sandhill Crane
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Scientific classification
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Binomial name |
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Grus canadensis |
The Sandhill Crane (Grus
canadensis) is a large crane of North America and extreme northeastern Siberia.
Adults are grey; they have
a red crown, white cheeks and a long dark pointed bill. They have long dark
legs which trail behind in flight and a long neck that is kept straight in
flight. Immature birds have reddish brown upperparts and grey underparts. Adult
cranes can reach four to five feet in height and weigh nine to twelve pounds,
with a wing span of up to seven feet. Both sexes look alike.
Their breeding habitat is
marshes and bogs in central and northern Canada, Alaska, part of the midwestern
and southeastern United States, Siberia and Cuba. They nest in marsh vegetation
or on the ground close to water. The female lays two eggs on a mound of
vegetation. Cranes mate for life; both parents feed the young, called colts,
who are soon able to feed themselves. The Sandhill Crane does not breed until
it is two to seven years old. It can live up to 25 years in the wild; in
captivity they have been known to live more than twice that span. Mated pairs
stay together year round, and migrate south as a group with their offspring.
Three subspecies are
resident; pulla of the Gulf Coast of USA, pratensis of Florida
and Georgia and nesiotes of Cuba. Others migrate to the southwestern United
States south to Mexico. The Platte River at the edge of Nebraska's Sandhills in
the American midwest is an important stopover for up to 450,000 of these birds
during migration. This crane is a rare vagrant to China, South Korea and Japan and
a very rare vagrant to western Europe.
These birds forage while
walking in shallow water or in fields, sometimes probing with their bills. They
are omnivorous, eating insects, aquatic plants and animals, rodents, seeds and
berries. Outside of the nesting season, they forage in large flocks, often in
cultivated areas.
This crane frequently gives
a loud trumpeting call that suggests a French-style "r" rolled in the
throat. Sandhill Cranes in flight can be differentiated from herons in that
they fly with their necks extended and by their nearly constant calls.
Sandhill Cranes have been
used as foster parents for Whooping Crane eggs and young in reintroduction
schemes for that species, a project which failed as these foster-raised
Whooping Cranes did not recognise other Whooping Cranes as their
conspecifics—attempting instead, unsuccessfully, to pair with Sandhills.
The Florida subspecies is
often seen in residential yards and these birds seem little afraid of human
approach. These visitors will eat shelled corn and commercially-purchased bird
seed from the ground and from feeders. They may be seen in yards in north
central Florida virtually year round, often in pairs or even pairs with a
juvenile crane accompanying them.
There are six subspecies
recognized:
Wikipedia
http://en.wikipedia.org/w/index.php?title=Sandhill_Crane&action=history
http://www.gnu.org/copyleft/fdl.html