Question

A mammal, which does not have pinna is:

• A. Platypus
• B. Whale
• C. Seal
• D. All of the above

Answer 1

The correct option is A Platypus

Pinna is the outer or external part of ear that receives soundwaves and transfers them to the auditory canal. Pinna is present in mammals with some exceptions. Egg laying mammal Platypus lacks pinna and due to this, its sense of hearing is not strong. The ears of Platypus have a small opening towards the outside from which sound waves enter.

So, the correct answer is 'Platypus'.