Solution:
Bungarus (krait) is a poisonous snake.
Snakes lack external ear openings, tympanum and middle ear.
They can only perceive ground vibrations but not sound vibrations. Psittacula (parrot) is a bird.
Birds have external ear openings though external ear lobe (pinna) is absent.
Panthera (tiger) and Canis (dog) are the mammals with both external ear openings as well as pinnae.
