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海豚有多少个鱼鳍
更新时间: 2020-06-27 00:00:00  

海豚的鱼鳍生长于背部,海豚的背鳍其实只是皮肤衍生而来的。海豚是与鲸和鼠海豚密切相关的水生哺乳动物,大约于1千万年前的中新世进化而成,广泛生活在大陆架附近的浅海里,偶见于淡水之中。主要以鱼类和软体动物为食。海豚的分布极广,种类极多,海豚是大型食肉动物,处于食物链的顶端,除了较为凶猛的鲨鱼之外,其它海洋生物基本不对其构成威胁。

关键词: 海豚 多少 鱼鳍

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