Come along on a visit to a butterfly sanctuary near Angangueo, Michoacan, Mexico, where millions of Monarch Butterflies overwinter in conifer groves. (You’ll arrive about 1m10s in.) It’s a seasonal pause in one of the longest-known, multi-generational insect migrations on the planet.

Related recent news: Monarch Butterflies Use a Magnetic Compass During Migration. If you also happen to notice that Flight of the Butterflies is playing at your local science museum, be sure to see it.

Watch this next: Wonders of Life — Monarch Butterflies with Brian Cox.

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