Why does brain size not matter when comparing the intelligence of different species while having bigger organs like hearts, lungs, kidneys allows those organs to function better?

Question

Why does brain size not matter when comparing the intelligence of different species while having bigger organs like hearts, lungs, kidneys allows those organs to function better?

In: 5

Answer 1

Brains don’t just control intelligence, they control all your organs, bodily functions and nervous system. So larger animals will have larger brains but not necessarily more intelligence.

One way of defining intelligence is the brain to body mass ratio, this assumes some amount of brain controls some amount of the body and any ‘excess brain’ is used for thinking and problem solving.