More Monarch Butterflies Than Usual Appear to Be Migrating This Fall.
In North America, two separate monarch populations migrate every fall. For the eastern population of butterflies, their migration typically begins in the northeastern U.S. and Canada where they live for the summer. They then travel south throughout the country, passing through most states in the U.S. on their way to spend the winter in Mexico. But monarchs that live west of the Rocky Mountains head to California for the winter, traveling there from states like Nevada and Utah, and south from Washington and Oregon. In spring, each of these populations reverses its route to migrate northward for the summer.
https://www.yahoo.com/amphtml/lifestyle/more-monarch-butterflies-usual-appear-151250179.html
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