North American Monarch butterflies are known for their incredible mass migration (0) that brings millions of them to California and Mexico each winter. Monarch butterflies are the only butterflies that make a journey up to 3,000 miles (4,828 kilometers) long.
These insects must begin this journey each fall ahead of the cold weather, (16)
.
Butterflies that leave their cocoon in late summer and early fall are different from (17)
.
These monarchs are born to fly, and because of the changing weather (18)
.
Only monarchs born in late summer or early fall make the migration, (19)
.
The winter habitat of monarchs provides access to streams, and plenty of sunlight to raise their body temperature (20)
. The habitat is also relatively free from predators.
Both females and males typically mate more than once. Mating for the migrating population takes place in spring.
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