Ostriches have tiny heads for their bodies

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There would be no difficulty in guiding a warm-blooded system with an alligator-sized brain stem. The link between being warm-blooded and having big brains must be, at best, an indirect one. Brain tissue is vulnerable to changes in temperature. (life size dinosaur)Human brains addle when heated to 108掳F even for a few minutes, and higher cerebral functions become erratic when the brain is chilled below 90掳F. So warm-bloodedness and a constant body temperature are prerequisites for a large brain. It may well be that warm-bloodedness evolved first, and the evolution of large brains followed. Warm-bloodedness would have been an advantage even to an animal with an alligator's brain power, because a constant high body temperature speeds growth, accelerates reproduction, optimizes muscular output, and increases digestive efficiency. And once acquired, it might have launched an evolutionary tendency toward larger brains.

 

More importantly, a survey of brain sizes in today's creatures leads me to conclude that large brains aren't essential for having a high metabolism. Humans have the biggest brains ever evolved for our weight class.(walking dinosaur costume) But we don't possess a higher metabolism than a German shepherd, which has a brain one seventh the size of ours. Ostriches have tiny heads for their bodies, and ostrich brains are only one fortieth the size of that of a human of the same weight. Does an ostrich therefore have a metabolism one fortieth that of a human? On the contrary, its metabolism is higher, pound for pound, than ours. It is thus very difficult for me to believe that metabolism and brain size evolved in a kind of evolutionary lock step.

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