Monitoring the Monarchs
Last month, monarch butterflies began an annual northward journey from their overwintering habitat in Mexico. Monarch expert Lincoln Brower discusses the dwindling monarch population. Brower says the plunge in butterfly numbers is due, in part, to a combination of habitat loss in Mexico and a decline in milkweed plants in the U.S.
Lincoln Brower is professor emeritus of zoology at the University of Florida and biology professor at Sweet Briar College in Sweet Briar, Virginia.