In order for gestation, in other words, for your babies to develop really, really well, even for reptiles, you got to have that right temperature. So a lot of reptiles, they drop their air, they put it in the soil,. They do a little kiss, throw it up to the sky, be like, hope it works out. What happens in mammals is, you know what, I need to be able to move and I need to keep the temperature going. But there's still some trade-offs between movement and loss of dexterity.

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