Jingszo !

Modern birds are the living relatives of dinosaurs. Take a look at the features of flightless birds like chickens and ostriches that walk upright on two hind legs, or predators like eagles and hawks with their sharp talons and keen eyesight, and the similarities to small theropod dinosaurs like the velociraptors of "Jurassic Park" fame are striking.

Yet birds differ from their reptile ancestors in many important ways. A turning point in their evolution was the development of larger brains, which in turn led to changes in the size and shape of their skulls.