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Monarch butterflies migrate alone. They do not travel in flocks the way many birds do. So why do they come together at night and form roosts like the one in the picture below? How do they find one another? Let's see what scientists know — and don't know — about this unusual monarch behavior. Photo: Harvey Medland   This Season Teachers Kids Orientation Registration Search Copyright 1997-2009 Journey North. All Rights Reserved. Questions or comments? Contact us.