Assertion: blackbird's nest | /r/HasProperty | grass
Facets:
Source sentences:
text: The nest is an untidy cup built by the female from vegetation, such as grass and twigs, and bound together with mud and finer grasses.
text: The female builds the nest, which is a bulky, open cup made of leaves, stems, and grass, and lashed to cattails or other plants growing over the water.