"Monarch butterflies fly from Canada and the U.S. southward for up to 3,500 km and overwinter in Mexico for approximately five months without breeding. Then, at the end of March, they reach sexual maturity and survivors remigrate northward for an additional 1,500 km to the U.S. Gulf Coast states where they lay their eggs and die. The ensuing generation of adults continues the migration northwards into southern Canada and, over the summer, as many as three more generations are born. The annual migration cycle is completed when the adults born in the last summer generation begin the fall migration in late August and early September." Monica Missrie, World Wildlife Foundation/Mexico
