Hollow bones, curved wings to make them aerodynamic and light feathers to make them almost weightless.
There is no such thing as a dinosaur that flys. The difference between a pteradoctyl and a bird is: Birds have feathers and pteradoctyl's don't. The difference between a oviraptor and a bird is: Oviraptor have hands and birds have wings.
Their bones are hollow which makes the bird light. With its lightness it is able to fly.
Emus, ostriches, and kiwis are three birds that cannot fly.
Birds have several adaptations that enable them to fly, including lightweight hollow bones for reducing weight, a keen sense of vision to navigate in the air, strong chest muscles for flapping wings, a streamlined body shape for minimizing air resistance, and an efficient respiratory system to supply oxygen to their muscles. Additionally, many birds have specialized feathers that provide lift and control during flight.
birds have hollow bones and light feathers that make them able to fly flap and glide, dont you wish you could fly?
Birds have there forelimbs modified into wings to fly. The chest muscles has to be very much stronger in birds to enable them to fly. To bear the force of flying, the sternum in birds has be relatively large as compared to human being.
Three Million
Kiwi, Ostrich, Cassowary.
sit around and eat cheese sticks
All have adaptations to some extent. However in some cases they are insufficient to allow flight. Ostriches cannot fly for instance, though they have wings. It can be argued that penguins 'fly' under water.
Penguins cannot fly, nor did the dodo, which is why it is extinct. Also the emu and the ostrich. Neither of those two birds can fly.
Penguin kiwi ostrich