Assertion: frog's eardrum | /r/HasProperty | tympanic membranes
Facets:
Source sentences:
text: They do not have external ears; the eardrums (tympanic membranes) are directly exposed or may be covered by a layer of skin and are visible as a circular area just behind the eye.
text: Instead, they have an eardrum called the tympanum that sits just behind each eye.