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Malacosoma americanum
The caterpillars are hairy with areas of blue, white, black and orange. The blue and white colors are structural colors created by the selective filtering of light by microtubules that arise on the cuticle.
This was found in woodland near Oxley Nature Center, Tulsa, OK, USA.
There were nests of these everywhere I looked. It took a while though to find a caterpillar outside a nest to get a photo.
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