Bummer: Illegal logging allegedly causing monarch butterflies to freeze to death

Living on Earth: Messed Up Migrations

WILCOVE: The Monarchs face a number of problems. The one that’s gotten the most attention over the years has been illegal logging of the forests on that mountain in Mexico where they winter. So if you imagine the trees as providing a kind of thermal blanket for the butterflies, the illegal logging essentially means that we’re cutting holes in the blanket, and so when the cold weather hits, many of the Monarchs freeze to death.