What if brain size in vertebrates depends on body temperature?

What if brain size in vertebrates depends on body temperature?

Sample: 2 600 vertebrate species.

Researchers compared brain sizes between warm-blooded (mammals, birds) and cold-blooded (reptiles, amphibians, fish) species.

Shown: the key factor determining brain size is the ability to maintain a stable body temperature. Warm-blooded species can afford larger brains because their metabolism provides a constant energy supply. Both groups (warm- and cold-blooded) show brain size dependence on environmental temperature - even among cold-blooded species, those living in warm waters or actively seeking warm habitats have larger brains. If a species lacked the energy to support brain development, brain size was limited regardless of other factors. In humans, the combination of warm-bloodedness, large offspring, and extended parental care enabled the evolution of the largest brain-to-body size ratio of all vertebrates.

Like this if you have a big brain!

Link to an article.