Monarch butterflies are in trouble. Populations have declined steeply in recent years. A 2017 report found that monarchs in the Western U.S. could be extinct within decades if the current trends continue. New research is shedding light on some of the factors at play and some of them are unexpected like an increase in the size of monarchs. Andy Davis is a Research Scientist, Odum School of Ecology, University of Georgia and Editor of the journal, Animal Migration . He's also the author of the