The hot question of whether dinosaurs were warm-blooded or cold-blooded finally has a good answer.
And as it turns out, dinosaurs — Earth’s dominant land animals until an asteroid wiped them out by 65 million years ago — were somewhere in between. Scientists said they came to that conclusion after evaluating 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.