Velociraptors and some other dinosaurs had similar respiratory systems to those of modern-day diving birds, a new study says. Like most birds, these dinosaurs had, in addition to lungs, air sacs attached to their spines, the fossil study found. This ultra-efficient breathing system would have helped make the dinosaurs speedy predators.The finding is based on the identification of small bones like those that, in birds, act as levers, moving the ribs up and down, aerating the air sacs...

More ...