| 翻訳と辞書 |
| Whooping crane ： ウィキペディア英語版 |
Whooping crane
The whooping crane (''Grus americana''), the tallest North American bird, is an endangered crane species named for its whooping sound. In 2003, there were about 153 pairs of whooping cranes. Along with the sandhill crane, it is one of only two crane species found in North America. The whooping crane's lifespan is estimated to be 22 to 24 years in the wild. After being pushed to the brink of extinction by unregulated hunting and loss of habitat to just 21 wild and two captive whooping cranes by 1941, conservation efforts have led to a limited recovery. As of 2011, there are an estimated 437 birds in the wild and more than 165 in captivity.〔(Whooping Crane Status and Fact Sheet ), U.S. Fish and Wildlife Service. Retrieved on: February 03, 2008〕
==Description==
An adult whooping crane is white with a red crown and a long, dark, pointed bill. Immature whooping cranes are cinnamon brown. While in flight, their long necks are kept straight and their long dark legs trail behind. Adult whooping cranes' black wing tips are visible during flight.
The species can stand up to and have a wingspan of . Males weigh on average , while females weigh on average (Erickson, 1976). The body length averages about .〔http://www.nebraskabirdlibrary.org/index.php/gruiformes/gruidae/whooping-crane.html〕 The standard linear measurements of the whooping cranes are a wing chord length of , an exposed culmen length of and a tarsus of .〔()〕 The only other very large, long-legged white birds in North America are: the great egret, which is over a foot shorter and one-seventh the weight of this crane; the great white heron, which is a morph of the great blue heron in Florida; and the wood stork. All three other birds are at least 30% smaller than the whooping crane. Herons and storks are also quite different in structure from the crane.〔http://bna.birds.cornell.edu/bna/species/153/articles/introduction〕
Their calls are loud and can carry several kilometers. They express "guard calls", apparently to warn their partner about any potential danger. The crane pair will jointly call rhythmically ("unison call") after waking in the early morning, after courtship and when defending their territory. The first unison call ever recorded in the wild was taken in the whooping cranes' wintering area of the Aransas National Wildlife Refuge during December 1999 and is documented here 〔http://www.craneworld.de/deutsch/bildundton/rufe/schreiduett.html〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Whooping crane」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|