Assertion: ground squirrel's burrow | /r/ObjectUse | used for nesting
Facets:
Source sentences:
text: However, burrows used for nesting or hibernation may be as deep as 219 centimetres (86 in), and may have additional entrances and deep nesting and food storage chambers.
text: They also build complex deeper underground burrows used for nesting and hibernation.
text: They dig shallow blind-end emergency burrows as well as complex deeper underground burrows used for nesting and hibernation.