Every year, 100 million Monarch butterflies set off on an incredible journey across North America.
These beautiful creatures fly 2,000 miles to reach their remote destination: a tiny area high in the mountains of Mexico. Yet scientists are still puzzling over how the butterflies achieve this tremendous feat of endurance — and how, year after year, the Monarchs navigate with such hair’s-breadth precision. As this program reveals, the Monarch is a scientific marvel locked in an inspiring struggle for survival.
[Nova: The Incredible Journey of the Butterflies], Wednesday at 9 p.m. on PBS 6.