The mystery of lizard breath: One-way air flow may be 270 million years old

Air flows mostly in a one-way loop through the lungs of monitor lizards -- a breathing method shared by birds, alligators and presumably dinosaurs, according to a new study that may push the evolution of this trait back to 270 million years ago.

Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/_...