In this image of a preserved frog, the lower jaw and tongue have been removed to reveal the details of the upper surface of the oral cavity. Frogs are predators that capture prey (usually insects) with sticky tongues that are attached at the front, an arrangement that allows them to be everted to some distance. Prey are held by a two rows of tiny, sharp maxillary teeth (1) located on each side of the upper jaw as well as a pair of more centrally located, larger vomerine teeth (2).

Frogs breath by taking in air through a pair of external nares that enter the oral cavity through openings called internal nares (3). Note the openings to the eustachian tubes (4) that communicate with the middle ear cavity. These structures allow vertebrates to equalize the pressure on both sides of the eardrum.