A slender sensory tactile process on the lips of certain fish, such as catfish and cyprinoids: Some other fish, like the carp, goatfish, and a few kinds of sharks also have such barbels

The large European fresh-water fish (Barbus fluviatilis), possesses four barbels on its upper jaw, including any of various other species of Barbus.

Barbels or paps are also under the tongue of horses and cattle.