External ear openings are present in

Solution:

External ear openings are characteristic features of birds (Aves) and mammals (Mammalia). Reptiles, including snakes (Bungarus) and lizards (Calotes, Chameleon), typically do not possess external ear openings or pinnae. Snakes lack a tympanum and external ear openings entirely. Lizards have a tympanum that is either exposed or slightly depressed, but not an external opening in the same sense as birds. Birds, like Pavo (peacock), have external ear openings, although they are usually covered by feathers and lack a fleshy pinna. Therefore, among the given options, Pavo is the correct answer.