long-eared bat

The long-eared bat has large, elaborate pinnae that play a crucial role in its sonar system.

The pinna is the visible part of the outer ear, which serves to collect sound and funnel it into the external auditory meatus (ear canal). Also known as the auricle (which see for more anatomical details), it is present in some mammals, including humans, and is made of cartilage. In some species, such as cats and dogs, the pinna is movable and helps locate the direction from which sounds are coming.