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 populations, and explains how habitat loss in Mexico and a decline in milkweed plant numbers in the U.S. may be harming the familiar orange and black fliers.

Source: http://www.npr.org/2013/04/12/177029257/monitoring-the-monarchs?ft=1&f=1007

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