Assertion: burrow | /r/HasProperty | invaded
Facets:
Source sentences:
text: This second hole has no excavated dirt around it and is called a bolt hole, and may serve as escape exits in case the burrow is invaded.
text: They prefer to retreat to their burrows when threatened; if the burrow is invaded, the groundhog tenaciously defends itself with its two large incisors and front claws.