Assertion: frog | /r/HasAspect | tympanum
Facets:
value: on each side of their heads
type: LOCATION
Source sentences:
text: They have a tympanum on each side of their heads which is involved in hearing and, in some species, is covered by skin.
text: While frogs don't have an external ear as humans do, they have an inner ear, middle ear, and an outer ear drum or tympanum.