A new study revealed that the endangered monarch butterfly is breeding in Mexico after facing a threat of extinction last year, giving hope to researchers who track its migration and conduct studies to preserve it.

Hundreds of millions of monarch butterflies annually make a major migration from Canada and the United States to the wintering grounds of Mexico. Once in mexico

The butterflies face several challenges that threaten their extinction, including climate change and illegal logging as well as the increasing scarcity of the plants in which they lay their eggs.