- 1、本文档共18页,可阅读全部内容。
- 2、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。
- 3、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载。
- 4、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
查看更多
北极熊英文介绍
The largest terrestrial carnivorous animal Polar bear some pictures about Polar bear The polar bear is a bear native largely within the Arctic Circle encompassing(围绕,包围;) the Arctic Ocean, its surrounding seas and surrounding land masses. It is the world‘s largest land carnivore(食肉动物) and also the largest bear Polar bears In its existent space, it is the topmost food chain. It has thick fat and hair to stay warm, its white appearance on white snow is good protective coloration, and it can on land and sea, so it can catch food in the arctic in this extremely harsh(严酷的) climate. Ecological role The polar bear is the?apex predator(顶端食肉动物)?within its range. Several animal species, particularly?Arctic Foxes?and?Glaucous Gulls, routinely scavenge(清除) polar bear kills. The relationship between ringed seals(环斑海豹) and polar bears is so close that the abundance of ringed seals in some areas appears to regulate(调节) the density(密度) of polar bears, while polar bear predation in turn regulates density and reproductive success of ringed seals. The?evolutionary pressure?of polar bear predation on seals probably accounts for some significant differences between Arctic and Antarctic seals. Because polar bears play an important role in Arctic environment, scientists feel that polar bear can be a good indicator of the health of Arctic environment. So, we can say that by protecting polar bears, we are protecting the whole Arctic ecosystem. Global warming has an impact on the ice. The ice is melting quickly in north and south pole. And that have a bad influence on polar bears. Due to the global warming, Arctic ice began to melt, the polar bear’s home has been destroyed, the prey is also a corresponding reduction in Polar bears are in danger, we must take measures to protect the kind of beautiful and lovely animal. Because it is the treasure of nature. Physical character The polar bears claws are short and stocky . the teeth are larger and sharper Polar bear fur consists of de
文档评论(0)