Assertion: crocodile's flap | /r/CapableOf | close off their ears
Facets:
Source sentences:
text: They also have external flaps that close off their ears and nostrils, and a special respiratory system that allows them to remain in the water for up to five hours at a time.
text: Along with this, they have external flaps that close over their ears and nostrils to protect them from the incoming water, and a flap that closes at the back of their mouths to prevent water from entering their lungs.