In a new study, University of Georgia scientists found hotter temperatures make monarch butterflies more vulnerable to parasites and less tolerant of the natural toxins found in their food.
Monarchs migrate every year from their summer home in the northern United States and Canada to overwinter in Mexico.
But according to Sonia Altizer, head of UGA’s Department of Entomology, more and more of them aren’t making the full trip down south.
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