<P> In animal anatomy, Henry's pocket, more formally known as a cutaneous marginal pouch, is a fold of skin forming an open pouch on the lower posterior part of the external ear . The pocket is situated in the location occupied by the antitragus in the human ear . It occurs in a number of species, but is particularly noticeable on the domestic cat, Felis catus, as well as some dog breeds . </P> <P> The pocket is of unknown function, and it is unclear if any exists . However, one hypothesis is that it aids in the detection of high - pitched sounds by attenuating lower pitches, especially when the ear is angled, common for a cat when hunting . </P>

What is the split in a cat's ear