Assertion: manatee's ear bone | /r/HasProperty | large inner
Facets:
Source sentences:
text: Their hearing is also great, even though they have no outer ear structures (they have large inner ear bones).
text: Their hearing is good too, despite not having outer ear structures, because manatees have large inner ear bones.
text: They lack outer ear structures but have large inner ear bones that give them their excellent hearing abilities.