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为什么北极没有企鹅
在我们的印象里,北极和南极同是冰天雪地,自然条件差不多。那为什么北极没有企鹅呢?
其实很久以前企鹅在北极生存过,只是现在灭绝了。
“北极大企鹅”身高60厘米,头部棕色,背部羽毛呈黑色,数量曾达几百万只。
大约1000年前,北欧海盗发现了大企鹅,16世纪后兴起了北极探险热,大企鹅遭到狂捕滥杀,从此灭绝了。
而如今生活在南极的企鹅,其祖先是赤道以南的管鼻类动物。
由于忍受不了赤道水流和较高的气温,它的祖先们没有选择向北挺进,而是选择生活在来自南极冰雪融化的水或深海涌来的较冷的水流经的海域里。