Assertion: american eel | /r/HasProperty | nocturnal
Facets:
value: in their yellow phase
type: TEMPORAL
Source sentences:
text: In their yellow phase, American eels are nocturnal, swimming and feeding at night.
text: The European Eel, Anguilla anguilla and the American Eel, Anguilla rostrata are nocturnal freshwater fish that prefer muddy bottoms.