The feet of a kingfisher are adapted for ...............

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.

Give scientific reasons: Birds can fly for long distances continuously.

Pneumatic bones can be found in:

Give scientific reason: Birds show adaptations for flight.

The wishbone of the birds is derived from