Assertion: cormorant's guano | /r/HasProperty | excrement
Facets:
Source sentences:
text: Over time the accumulated guano (excrement) can kill trees and other vegetation, making it unsuitable for nesting.
text: Most pelecaniform birds are of rather little significance to humans, but the guano (excrement) of cormorants, boobies, and pelicans is an important fertilizer.