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A Second Wave of Painted Ladies and the Colorado Convergence

A second wave of migrating Painted Ladies arrived in central Iowa and eastern Nebraska on September 28 when a cool front passed through our area. It had been looking as if the first wave that had arrived on September 5 was about finished, and then all of a sudden there were many more again. These butterflies were generally smaller than those in the first wave, and unlike them, were a mix of different sizes and degrees of wing wear and wing damage. Many of them seem to have ridden the wind toward the west-southwest, reaching the Denver/Boulder, Colorado area on October 3, when the National Weather Service in Boulder spotted radar echoes that they first attributed to migrating birds. They soon realized that the echoes were due to large numbers of Painted Ladies flying northwest with the local winds occurring at that time. Their observation came at the same time that large numbers of Painted Ladies suddenly appeared in Denver for the second time this fall:

From USA Today: ...more ↓

Posted on October 06, 2017 07:27 PM by iowabiologist iowabiologist | 0 comments | Leave a comment
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The Vanessa Migration Project is an opportunity for you to share your observations of Vanessa butterflies to find out how they migrate and distribute themselves across North America each year. We are tracking the movements and seasonal changes in their distribution as their range expands northward in the spring and ...more ↓

Mini iowabiologist created this project on March 29, 2016

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