The annual migration of North Americaâs monarch butterfly is a unique and
amazing phenomenon. The monarch is the only butterfly known to make a
two-way migration as birds do. Unlike other butterflies that can
overwinter as larvae, pupae, or even as adults in some species, monarchs
cannot survive the cold winters of northern climates. Using environmental
cues, the monarchs know when it is time to travel south for the winter.
Monarchs use a combination of air currents and thermals to travel long
distances. Some fly as far as 3,000 miles to reach their winter home!
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