Cerro Pelón is an extinct volcanic massif in the Monarch Butterfly Biosphere Reserve. Viewed from a helicopter, avocado plantations cover its foothills. Farming and commercial logging are spreading in ...

In some regions, the monarch butterfly is known by another nickname, the wanderer, which seems fitting, I think, for this ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. The US Fish and ...

The U.S. Fish and Wildlife Service plans to add the butterfly to the threatened species list by the end of next year following an extensive public comment period. “The iconic monarch butterfly ...