What is the role of feathers in birds?

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

Identify the correct statements regarding class $Aves$.
$I$. Forelimbs are modified into wings and hindlimbs are modified for walking and swimming.
$II$. Heart is completely four-chambered.
$III$. They are homeotherms.
$IV$. They are oviparous and development is direct.

What is the primary function of feathers in birds?

Which of the following features in birds indicates their reptilian ancestry?

In birds,the urinary bladder is ..........