Assertion: butterfly's migration | /r/HasProperty | annual
Facets:
Source sentences:
text: This ability to detect ultraviolet light guides monarch butterflies on their annual migration from North America to Mexico.
text: Habitat destruction has been a concern as the number of monarch butterflies that completed an annual migration to their winter home in a Mexican forest sank in 2013 to its lowest level in at least two decades, due mostly to extreme weather and changed farming practices in North America.
text: monarch butterfly Learn about the monarch butterfly, including its annual migration to Mexico.