逃出濒危名单的秃鹰 - 重磅推荐 - 《高中生》杂志 ● 新高考网
逃出濒危名单的秃鹰
作者:王琴芳 发布时间:2018-07-31 16:52:03 本文来源于:《高中生·天天向上》2018.8
  Living near a constant source of water,bald eagles feed on fish,ducks,snakes and turtles. They will also eat rabbits and dead animals. With their acute sense of sight and powerful claws,bald eagles attack their prey by swooping(俯冲)down on it at an angle. They can reach speeds of up to 160 km/hr when driving. Once they capture their target,they use their hooked beak to pull fresh out before eating it.

  Bald eagles can reach great heights when flying. Using thermal convection currents(对流),they can climb up to 3,000 m in the air. They can soar for hours using these currents. When cruising,they can fly about 65 km/hr. In addition,if their water source freezes,bald eagles may use thermal convection currents to migrate in the winter.

  Preferring to make their homes in large trees near bodies of water(both fresh and salt),bald eagles build enormous nests out of sticks. Generally speaking,their nests are at least half a meter deep and 1.5 m across but can be bigger. These giant nests have been known to weigh up to 900 kg.

  A mating pair produces up to three eggs a year,though it is not likely that all three will survive. Both parents take turns hatching the eggs. While one is hatching,the other searches for food or more nesting materials.

  In 2007,the bald eagles was removed from endangered and threatened species list kept by the United States Fish and Wildlife Service. In addition, IUCN’s Red List currently considers the bald eagle as a species of least concern of extinction. Their successful recovery is due to years of conservation efforts along with the ban on the pesticide(农药)DDT in 1972. While bald eagles have few natural enemies and are no longer considered endangered,threats still exist to the bald eagle,including habitat loss. As people move to the shores,they are cutting down trees and forcing eagles to make their homes elsewhere. Illegal hunting is another threat.

    ……

    更多精彩请阅读《高中生》杂志!

[《高中生》杂志·新高考网 责任编辑:陈姣]

关于我们 - 关于《高中生》杂志社 - 联系我们 - 编辑热线 - 投稿

copyright 2010-2016 中共湖南省委宣传部、湖南省教育厅主管,湖南教育报刊集团主办,《高中生》杂志社承办
ALL Rights Reserved

互联网出版许可证:新出版网证(湘)字017号 湘ICP备10000103号