Assertion: river otter | /r/HasProperty | excellent swimmers
Facets:
Source sentences:
text: North American river otters are excellent swimmers and divers, able to stay underwater for up to 8 minutes.
text: River otters are expert swimmers and have long and sensitive needle-like whiskers, which help them to sense preys underwater.
text: River otters are excellent swimmers.
text: They are excellent swimmers and divers, able to stay underwater for up to 8 minutes.