Question

why are birds light in weight​

Answer 1

Usually birds are light in weight beacuse the weight of there bones is very less

and there density is also less ,

so they also fly with them

Answer 2

Flying birds have light bones . A bird's bones are basically hollow with air sacs and thin, tiny cross pieces to make bones stronger. This reduces the force of weight. A rigid skeleton to provide firm attachments for powerful flight muscles which helps with the force of thrust..