The striking monarch butterfly is tougher than it looks. This tiny flier undertakes an incredible 2,000 mile journey every winter in search of a few specific mountaintops in the fir forests of
The climate of Central Mexico’s fir forests is just right for monarchs: not cold enough for the butterflies to freeze, but cold enough to keep their systems dormant until spring. However, global warming is causing more cool-weather precipitation in these areas, which is bad news for the butterflies since they can freeze to death if temperatures drop too low. Increased cool weather precipitation also spells trouble for monarchs because their wings must remain dry to stay warm—when rain follows a cold front, butterfly mortality can soar.
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