Drought puts heat on future of butterflies
Monday, November 28, 2011 - 15:30
in Biology & Nature
Each year, a mysteriously long-lived generation of monarch butterflies makes the harrowing trek from its birthplace in southern Canada and the northern United States to the species' wintering grounds in a patch of forest in Mexico, and this year, scientists are concerned that historic drought conditions along the way may have taken a toll on the colorful insects.