Question

Which of the following is not an aerial adaptaion of birds and why?
1) Presence of feathers over the body
2) Presence of dense bones
3) Streamlined body

Answer 1

Option 2, is the correct answer. Birds do not have dense bones.
The body of birds are adapted for flying. Many bones in birds are hollow which makes their body light weight. Flying birds have large chest muscles that move the wings. Birds have feathers that help them fly. The long flight feathers on the wings and tail help birds balance and steer. In addition, birds have a system of air sacs in their body that connect to the lungs. The air sacs enable birds to extract more oxygen from each breath of air than other animals can. Birds need extra oxygen to release large amount of energy to power their flight.