"Warm-bloodedness is one of the key factors that have enabled mammals to conquer the Earth, and to develop the most complex bodies in the animal kingdom. In this series, we will travel the world to discover just how varied and how astonishing mammals are."

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No member of the animal kingdom nurses past maturity, no member of the animal kingdom ever did a thing to me. Its why I don't eat red meat or white fish, don't give me no blue cheese. Were all members of the animal kingdom, leave your brothers and sisters in the sea.

— Prince