Biologists find that red-blooded vertebrates evolved twice, independently

"Through the process of natural selection, it finds new uses for existing features, often resulting in what is known as convergent evolution — the development of similar biological traits in different orders of animals, such as powered flight in birds and bats.

Now, research by University of Nebraska-Lincoln biologists has found convergent evolution of a key physiological innovation that traces back through the two deepest branches of the vertebrate family tree.

A team led by Jay Storz...