Cool find, BugQueen! These look like Fall Webworm Moth caterpillars. They also build web nests but are usually yellowish with long hairs. Malacosoma neustria is a species that does not occur in North America. There are a few species of moths from Genus Malacosoma in North America, but they tend to be darker and have more color. Here is a link so you can compare: http://bugguide.net/node/view/371/bgpage
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