Assertion: swan's parent | /r/CapableOf | help build the nest
Facets:
Source sentences:
text: Both parents help build the nest, using a variety of grasses, reeds, and aquatic vegetation.
text: Both parents help in the construction of the nest, which they build high up in a tree or on a cliff.
text: Both parents help build the nest, which is a large, low mound with a depression in the center.