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单词 Pacific Walrus
释义

Pacific Walrus

中文百科

海象 Walrus

(重定向自Pacific Walrus)
Cría de morsa en cautiverio

海象科Odobenidae)是食肉目鳍足亚目下的一科。海象科仅有海象Odobenus rosmarus)一种。

海象嘴短而阔,犬齿特别发达,似象牙,故名,用以掘食和攻防。有稀疏的坚硬的体毛,眼小,视力欠佳。四肢呈鳍状,后肢能弯曲到前方,可以在冰块和陆上行走。

海象体型巨大,雄性体重平均800-1700公斤,长度2.2-3.6米,一些个体可达到2000公斤。世界最大的雄性海象重2268公斤,长度4.9米。

海象的皮下脂肪极厚,可抵御的寒冷的极地环境。海象在陆地上与海水中皮肤的颜色不一样(在陆上皮肤呈棕红色,而在水中则呈白色),因为在水中,血管冷缩,将血从皮下脂肪层挤出,以减少热能的流失。

英语百科

Walrus 海象

(重定向自Pacific Walrus)
Walrus cows and yearlings (short tusks).  Photo courtesy USFWS
A walrus, labeled Ros marus piscis, is depicted in а 16th-century map of Scandinavia (the Carta Marina).

The walrus (Odobenus rosmarus) is a large flippered marine mammal with a discontinuous distribution about the North Pole in the Arctic Ocean and subarctic seas of the Northern Hemisphere. The walrus is the only living species in the family Odobenidae and genus Odobenus. This species is subdivided into three subspecies: the Atlantic walrus (O. r. rosmarus) which lives in the Atlantic Ocean, the Pacific walrus (O. r. divergens) which lives in the Pacific Ocean, and O. r. laptevi, which lives in the Laptev Sea of the Arctic Ocean.

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更新时间:2025/6/18 20:42:54