During the fall, eastern North American monarch butterflies (Danaus plexippus) migrate south from their northern range to overwinter in sites atop the mountains of Michoacán in central Mexico 1,2,3.

Scientists have identified a new component of the complex navigational system that allows monarch butterflies to transverse the 2,000 miles to their overwintering habitat each year. Monarchs use a ...

WORCESTER, MA – Each fall millions of monarch butterflies use a sophisticated navigation system to transverse 2,000 miles from breeding sites across the eastern United States to an overwintering ...