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进化最极端的哺乳动物:凶猛麝香牛已灭绝(3)
2009-05-13 09:41:37 中华网论坛 发表评论
    

    3.树袋熊

进化最极端的哺乳动物:凶猛麝香牛已灭绝

树袋熊

    树袋熊生活在澳大利亚东部的桉树森林里。虽然成年树袋熊的个头相当大,但是刚刚出生的树袋熊的体重还不足十分之一盎司(2克),因此能轻而易举把它放在茶匙里。虽然很多人认为树袋熊就是“熊”,但是这些有袋动物跟袋鼠和负鼠的亲缘关系更近一些。有袋鼠的幼仔在出生时发育还相当不完全,因此它们在出生后必须呆在妈妈的育儿袋里,靠吃母乳生长一段时间。



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