Assertion: wagtail's nest | /r/MadeOf | root
Facets:
Source sentences:
text: The nest is made of grass, roots, algae and other material with a central neat cup lined with hair.
text: The nests are made of moss, grass and roots, with a lining of hair and feathers; four to six eggs are laid, bluish white or brown, or yellowish with spots and markings.