Assertion: robin's feather | /r/ObjectUse | used for filling
Facets:
Source sentences:
text: Spider webs, feathers, and fur are used for binding or filling, and the nest is generally placed in a tree fork, or sometimes a mistletoe bush.
text: Spider webs, feathers and fur are used for binding or filling, and the nest is generally placed in a tree fork up to 5 m (15 ft) above the ground.