
The great migration of monarch butterflies from Canada to Mexico is down to white spots on the edge of their wings, according to new research.
It solves the mystery of one of nature’s most famous journeys, spanning 3,000 miles, say scientists.

The great migration of monarch butterflies from Canada to Mexico is down to white spots on the edge of their wings, according to new research.
It solves the mystery of one of nature’s most famous journeys, spanning 3,000 miles, say scientists.