In California, butterflies such as the monarch are critically endangered as a result of habitat erosion, pesticides, and climate change. But many people are trying to save these beautiful insects.

We meet the scientists who are painstakingly rearing individual butterflies by hand and then releasing them back into the wild.

And at the famous butterfly groves on the coast, we see the first signs of recovery.

Presenter: Myra Anubi

Photo: A monarch butterfly (Getty Images)