Assertion: frog's sound | /r/HasProperty | amplified by one or more vocal sacs
Facets:
value: in most calling frogs
type: OTHER
Source sentences:
text: In most calling frogs, the sound is amplified by one or more vocal sacs, membranes of skin under the throat or on the corner of the mouth, that distend during the amplification of the call.
text: In most calling frogs, the sound is amplified by one or more vocal sacs.