Assertion: hummingbird's chin | /r/HasProperty | hard
Facets:
value: because of their small size
type: CAUSE
value: to see on hummingbirds
type: OTHER
Source sentences:
text: Chin : The chin is hard to see on hummingbirds because of their small size, but it can be an important clue in some species, such as the broad-tailed hummingbird and ruby-throated hummingbird.
text: : The chin is hard to see on hummingbirds because of their small size, but it can be an important clue in some species, such as the broad-tailed hummingbird and ruby-throated hummingbird.