# 299：兽族崛起丨与巨龙同行

An episode of [原来是这样 Dscience](https://invisiblenetwork.ai/podcast/852289138), 3 Jul 2020, 49 min.

Audio: https://cdn.lizhi.fm/audio/2020/07/02/5120063917500511878_hd.mp3

真正的哺乳动物是什么时候出现的？哺乳动物的那些重要特征，比如毛发、胎生、哺乳，又是什么时候发展出来的？为什么说，恐龙时代的哺乳形类动物，也不全是”苟且偷生“的模样？一起回到侏罗纪，看看那些与巨龙同行的祖先吧！

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