Assertion: butterfly's time | /r/CapableOf | abandon their breeding grounds
Facets:
value: in canada
type: LOCATION
value: in the northern u.s.
type: LOCATION
Source sentences:
text: As the days get shorter and the weather cooler, they know it’s time to abandon their breeding grounds in the northern U.S. and Canada and head south to the mountains of central Mexico, where it’s warmer.