Monarch Butterfly

Monarchs spend the winter in the mountains of Mexico, where they cluster in fir trees for protection against rain and cold. If rainfall increases due to global warming, the trees might not provide enough protection. Meanwhile, hotter, drier climates in the eastern United States and Canada could push their habitats farther north, increasing migration distances. Milkweed, the host plant of Monarch larvae, might not be able to adapt to the new range.