Hand-Reared Monarch Butterflies Don’t Migrate

Every fall, millions of monarch butterflies engage in one of nature’s great spectacles, migrating from sites across North America to refuges in either central Mexico or coastal California, where winter temperatures are more tolerable. They fly south for thousands of miles, propelled by some innate sense of direction to places that neither they nor their parents have ever visited. But not all of them make the journey. Not all of them know the way.