Monarch Butterflies Undertake an Incredible Multi-Generational Migration

The monarch butterfly migration is one of the most spectacular natural phenomena. No single butterfly completes the entire round trip. Instead, it's a multi-generational relay. The generation that flies south to Mexico lives for 6-8 months, overwinters, and then starts the journey north, laying eggs along the way. Several shorter-lived generations continue the northward journey, with the final generation reaching Canada before the cycle repeats. How they navigate this incredible journey remains a subject of intense research.