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Monarch Butterfly Migration
October 01, 2014 1:06 PM
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The population of migrating monarchs that reach Mexico each year has dropped dramatically in recent years because of habitat loss, decline in food source and changes in climate. (Credit: Natalie Tarpein)
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Milkweed, the primary food source for monarch butterflies, has dropped in recent years mirroring the decline of the insect. (Credit: Creative Commons © jungle mama)
Monarch Butterfly Migration
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