The hot question of whether dinosaurs were warm-blooded like birds and mammals or cold blooded, like reptiles, fish and amphibians, finally has a good answer.
Dinosaurs, for eons Earth's dominant land animals until being wiped out by an asteroid 65 million years ago, were in fact somewhere in between.
Scientists said Thursday they evaluated the metabolism of numerous dinosaurs using a formula based on their body mass as revealed by the bulk of their thigh bones and their growth rates as shown by growth rings in fossil bones akin to those in trees.