Assertion: martin's nest | /r/MadeOf | feather
Facets:
Source sentences:
text: The nest of a swift is made of twigs, buds, moss, or feathers and is glued with its sticky saliva to the wall of a cave or the inside of a chimney, rock crack, or hollow tree.
text: The nest inside the cavity is built by the female, and is made of plant fibres, grasses, moss, hair, wool and feathers.