What is the role of feathers in birds?

Characteristic features such as a four-chambered heart,feathers,and pneumatic bones are applicable to which class of vertebrates?

If a bird is transferred from $30^oC$ to $10^oC$,its body temperature will change to:

Which of the following characteristics is $NOT$ associated with Aves (birds)?

Which of the following is $NOT$ found in birds?

Only one ovary is present in the