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Monarchs, Mountains and Moisture By Dr. Lincoln Brower, Sweet Briar College 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. These pictures tell the story... I took this picture early in the morning, as the clouds were forming and blowing through the butterfly colony. (The colony is just outside of the image, to the left.) Photo ©Lincoln Brower, Sweet Briar College This Season Teachers Kids Orientation Registration Search Copyright 1997-2009 Journey North. All Rights Reserved. Questions or comments? Contact us.