Which of the following is not a bird?

1. A

   Golden Mahseer

   Golden Mahseer. A Himalayan carp (fish), not a bird.

2. B

   Indian Nightjar

   Indian Nightjar. A nocturnal bird.

3. C

   Spoonbill

   Spoonbill. A wading bird.

4. D

   White Ibis

   White Ibis. A wading bird.

Summary. Official key is (a) Golden Mahseer. Tor putitora is a fish. Nightjar, spoonbill and white ibis are birds.