Monarch migration can be invisible to us when we watch from the ground. There is a large gap overhead where monarchs can travel and we can't see them. Journey North tracks migration based on visual observations, so questions about the height of flight are important:

Driving Question: How high do monarchs fly - and how high can we see them?

For use with Photo Gallery: How High Do Monarchs Fly?

Monarch migration can be invisible to us when we watch from the ground. There is a large gap overhead where monarchs can travel and we can't see them. Journey North tracks migration based on visual observations, so questions about the height of flight are important: How high do monarchs fly - and how high can we see them?