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Monarchs must not get too cold! Monarchs save energy by living in a cool place, but there are also dangers. If temperatures are too cold, monarch butterflies can freeze to death. Wet, cold monarchs are in particular danger. Ice crystals can form and kill the butterfly. Photo © Dr. Lincoln P. Brower, Sweet Briar College     Copyright 1997-2013 Journey North. All Rights Reserved.   Contact Us    Search