Assertion: hummingbird's nest | /r/MadeOf | plant fibers
Facets:
Source sentences:
text: Once hummingbirds have mated the female builds a cup like nest made of plant fibers, small bits of leaves, spider silk, and twigs which they anchor to a tree about ten to forty feet off the ground.
text: The nest is made of grasses and plant fibers, and held together with spider silk.