WATCH RELATED VIDEO Submit Migratory monarch butterfly populations rebounded to 68 percent of a 22-year average in 2015, according to a new study, occupying almost 10 acres of forest in their Mexican hibernation areas. Advertisement © 2017 HNGN, All rights reserved. Do not reproduce without permission. Advertisement 0 COMMENTS CLOSE COMMENT Get HNGN's Top Stories Newsletter Everyweek You have already subscribed. Thank you.