Question

Did the common ancestor of birds and mammals have warm blood?

Answer 1

Probably not, but the matter is still being debated. The nearest common ancestor of birds mammals was probably an eight- inch long reptile that lived anywhere between 320 and 340 million years ago. Its an sector 360 million years ago was still a fish , four- footed, with lungs, but relying mainly on gill- breathing, and just occasionally dragging itself on to land for brief periods.