Question

which of the following is not an aerial adaptation of a bird​

Answer 1

Answer:

Single ovary will reduce body weight and Keel is an extension of sternum bone for attachment of flight muscles. Pneumatic hollow bones also help birds in flight. Gizzard is not a characteristic feature of birds only. In addition to birds, it is present in several other animals and does not help birds in flight in any manner. Its main function is grinding of food.

So, the correct answer is 'Gizzard'.