Cover image: Monarch butterflies accumulate lipids during their fall migration and expend them over a 5-month overwintering period in Mexico. This photograph shows butterflies that had sufficient lipid reserves to survive the winter, bursting out of their tree clusters in successive waves as they begin their spring remigration to the Gulf Coast of the United States. This photograph was taken on 15 March 2006 in the Ojo de Agua on Cerro Pelon, in the Monarch Butterfly Biosphere Reserve in Mexico. Image L. P. Brower. Submitted by Lincoln P. Brower, Linda S. Fink, and Peter Walford, “Fueling the fall migration of the monarch butterfly.”
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