Monarch Migration in Mexico – Florida Museum https://www.floridamuseum.ufl.edu/event/expedition-monarchs-andrei/
One of the most amazing phenomena in nature is the annual migration of millions of Monarch butterflies, Danaus plexippus, southward from their breeding grounds in the United States and Canada east of the Rocky Mountains to overwintering sites in the mountains of southern Mexico.
millions of butterflies will take flight from the roosts and sail to nearby stream banks