Too Cold to Fly?
The Effects of Temperature on Fall Migration
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Too Cold to Fly? The Effects of Temperature on Fall Migration

 

Monarch butterflies are in a race against time during fall migration. They must leave the north before they're trapped by the cold. Monarchs are cold-blooded so, in order to fly, their flight muscles must be warm enough. The facts and photos in this slideshow to explore the question:

Essential Question
How do temperatures affect fall monarch migration?