Which feature helps birds to fly in air?

Which of the birds has teeth

Give characteristic features that help a bird in flight.

A unique feature of birds is

A bird is flying up at an angle sin^(-1)(3//5) with the horizontal. A fish in a pond looks at that bird when it is vertically above the fish. The angle at which the bird appears to fly (to the fish) is [mu_(w) = 4//3]

Which one of these was a flying dinosaur

In which period the birds originated?

Which one is wader bird

In cockroach the wings that help in flying are

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that

State three features of birds that have contributed to the success of this group.