Assertion: butterfly | /r/HasProperty | valuable
Facets:
value: for many birds
type: TRANSITIVE-OBJECT
value: by butterfly collectors
type: OTHER
Source sentences:
text: One of the reasons it is so that the butterflies of this genus are considered valuable by butterfly collectors.
text: The decreasing number of butterflies is dangerous since they are a valuable source of food for many birds and assist in the pollination of flowers as well.