Option (4) is the correct answer because two additional chambers like crop and gizzard in alimentary canal are present in birds. Pavo (Peacock), Psittacula (Parrot), Corvus (Crow) and Columba (Pigeon) are birds. Option (1), (2) and (3) are incorrect because Catla is a bony fish, Crocodilus, Chameleon and Bangarus are reptiles, Bufo is an amphibian and Balaenoptera is an aquatic mammal.