Spring Migration: A Race Against Time Time to Go! Time to Go! Fat is Falling Fat is Falling Temperatures are Rising Temperatures are Rising Water is Scarce Water is Scarce Time is running out because mating begins as temperatures rise. Monarchs live for only a few weeks after they mate. Time is running out because mating begins as temperatures rise. Monarchs live for only a few weeks after they mate. Monarchs Need Milkweed Monarchs Need Milkweed Spring is Coming in the North Spring is Coming in the North Sensing Change Sensing Change Here Come the Monarchs! Here Come the Monarchs! Track Spring's Journey North Track Spring's Journey North Companion Resources Journal Photo Gallery Text Only Teaching Suggestions Driving Question By the end of March, the monarchs can't stay in Mexico any longer — but they can't move north too quickly either. What changes are occurring in the butterflies and in their habitat?
