In birds and reptiles, a single ossicle spans the air-filled middle ear cavity, transferring vibrations from the external to inner ear. In birds this ossicle is known as the columella auris, while in reptiles it is known as the
Do birds have 3 middle ear bones?
Having three ossicles in the middle ear is one of the defining features of mammals. All reptiles and birds have only one middle ear ossicle, the stapes or columella.
What animals have ossicles?
Ossicles are small calcareous elements embedded in the dermis of the body wall of echinoderms. They form part of the endoskeleton and provide rigidity and protection. They are found in different forms and arrangements in sea urchins, starfish, brittle stars, sea cucumbers, and crinoids.
