

The Monarch's Spring Migration
A Race Against Time

(More Slideshows)

Back to News Update

The Annual Cycle of the Monarch Butterfly

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?


Journey North Home Page   Facebook Pinterest Twitter   Annenberg Media Home Page