Question

water proof nature of aquatic birds is due to
​

Answer 1

Answer:

• Birds pick up oil on their beaks, by rubbing against the uropygial or preen gland near the tail, and then rub it over their feathers. This coating insulates the interlocking barbules in the feather. As water cannot penetrate through the oil coating, the feather is waterproof.

Explanation:

HopeithelpU

Answer 2

Answer:

The preening gland secretes wax and fats which make aquatic animals water proof