Challenge Question #4

Donna Wimmer (dwimme@mciunix.mciu.k12.pa.us)
Tue, 11 Mar 1997 19:47:07 -0400

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We think the monarchs know when it is time to leave Mexico by the length of
daylight. They can determine when to start migrating north by the
photoperiod. As the days get longer, they realize it is time to leave.
They also know when to leave by the temperature. As the temperature rises
for several consecutive days, they know it is time to migrate.

Donna Wimmer
87 West Park Ave.
Sellersville, PA 18960
dwimmer@mciunix.mciu.k12.pa.us

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