Coloured X-ray of the skull of a bat showing well-developed organs of the inner ear used for echolocation.

Coloured X-ray of the skull of a bat showing well-developed organs of the inner ear used for echolocation. On either side of the base of this bat skull are large coiled cochlea, the organs of hearing. Many bats use echolocation to navigate when flying at night, and to detect and capture their prey.

Image via Science Photo Library