The fold of skin (pouch) on the lower part of a cat’s ear is called the pinna. The pinna helps the cat to better detect and respond to sound. It is also used to regulate the cat's body temperature, by trapping heat and releasing it when needed.
Join now this cat-lovers community - AskCat.org. Ask and answer questions about cats.
Ask a cat question - Answer to feline queries | AskCat.org - A space for cat lovers.