The size of mammal ancestors' ear canals reveal when warm-bloodedness evolved: Higher body temperatures went hand-in-hand with runnier 'ear fluid' and narrower ear canals - Science Daily

Warm-bloodedness is a key mammal trait, but it's been a mystery when our ancestors evolved it. A new study points to an unlikely source for telling a fossil animal's body temperature: the size of tiny structures in their inner ears. The fluid in our ears beco…

Warm-bloodedness is a key mammal trait, but it's been a mystery when our ancestors evolved it. A new study in Nature points to an unlikely source for telling a fossil animal's body temperature: the s… [+4776 chars]

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