Assertion: national park's variety | /r/CapableOf | serve as main source of food
Facets:
value: for many birds
type: TRANSITIVE-OBJECT
Source sentences:
text: Within the Florida mangrove systems live 220 species of fish, and a variety of crabs, crayfish, shrimp, mollusks, and other invertebrates, which serve as the main source of food for many birds.