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When monarch butterflies arrive from Mexico in the early spring, milkweed is just beginning to emerge from the ground. Female monarchs are at the end of their lives. They must find milkweed quickly and lay their eggs before they die. Milkweed is the only food their young will eat, so finding it is of the utmost importance. Photo: Jim Conner This Season Teachers Kids Orientation Registration Search Copyright 1997-2009 Journey North. All Rights Reserved. Questions or comments? Contact us.