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Who's Been Eating the Monarchs? Monarchs and Their Predators in Mexico Monarch butterflies are full of fat. This fat gives them the energy they need to survive the winter. A colony of 50 million butterflies would contain about 1,500 pounds of fat. For a hungry predator, a monarch colony could be a jackpot. But there's a problem... This Season Teachers Kids Orientation Registration Search Copyright 1997-2009 Journey North. All Rights Reserved. Questions or comments? Contact us.