Monarch
butterflies can fly high overhead during migration. They sometimes
fly so high that nobody can see them!
At
what height does a monarch disappear from view? We designed an experiment
to find out. This is where we began. What do you think we did next?
![](https://s3.us-east-2.amazonaws.com/journeynorth.org/images/graphics/monarch/sl/flight/EyeTest0.jpg)
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