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Get latest articles and stories on Science at LatestLY. Washington [U. 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 becomes runnier at higher temperatures, so animals with warm bodies don t need as big of canals for it to flow through. Turns out, mammal ancestors became warm-blooded nearly 20 million years later than previously thought. Science News | Size of Mammal Ancestors Ear Canals Reveal when Warm-bloodedness Evolved.

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