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Here come the monarchs! Spring migration begins every March in a flurry. The monarchs are in a race against time. They can't stay in Mexico any longer — but they can't move north too quickly either. The timing of the monarchs' spring migration must be precise. How do the they know when to leave, and why do they go now? This Season Teachers Kids Orientation Registration Search Copyright 1997-2009 Journey North. All Rights Reserved. Questions or comments? Contact us.