Life
Dinosaurs shrank for 50 million years to become birds
From left to right: a neotheropod, a tetanuran, a coelurosaur, a paravian and Archaeopteryx (Image: Davide Bonnadonna) It took 50 million years of continual shrinking to turn massive, lumbering dinosaurs into the first small flying birds . "No other dinosaur group has undergone such a long and extended period of miniaturisation," says Mike Lee of …