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Monarchs Need Moisture
Moisture is crucial for the butterflies’ overwintering success in Mexico. I hypothesize that one of the reasons the butterflies choose to overwinter where they do is because the high altitude mountains capture moisture. The pictures in this slideshow tell the story. I took the picture below early in the morning, as the clouds were forming and blowing through the butterfly colony. (The butterfly colony is just outside of the image, to the left.)

Photo ©Lincoln Brower, Sweet Briar College