Every year monarch butterflies migrate across North America to a remote area of Mexico. This presentation discusses how the butterflies navigate and endure the long journey and takes you to the locations they call home.

Originally broadcast as an episode of the television program Nova on Jan. 27, 2009. Edited and rewritten version of the 2007 documentary film 'Four wings and a prayer' with some new material. With the participation of Ministry of Research (France), PROCIREP/ANGOA, France 2, NHK, Plante Câble, the Documentary Channel and the Canadian Television Fund. Based on the book Four wings and a prayer by Sue Halpern. Special features: printable materials for educators (PDF files).

1. Birth of a monarch -- 2. Soaring over land and lakes -- 3. Destination Mexico -- 4. An endangered refuge -- 5. Gathering flocks -- 6. An awesome spectacle.