Grade 7 and up. Every year, 100 million monarch butterflies set off on an incredible journey, flying 2,000 miles to reach a tiny area high in the mountains of Mexico. Yet scientists are still puzzling over how the butterflies achieve this tremendous feat of endurance.

NOVA® flies along with the monarchs, visiting the spectacular locations they call home, and meeting the dangers they encounter along the way. Shot in stunning detail, the film reveals these scientific marvels locked in an inspiring struggle for survival.

Includes materials and activities for educators and public performance rights. Close-captioned. 56 minutes. 2009.