Tent Caterpillars ~ aka, Fall Webworms
Thanks to CHRISTINE for identifying these horrifying creatures!

"Larvae feed on foliage throughout their development, and secrete silk which they spin into small webs.
As they grow, they enlarge the webs, which can sometimes enclose the entire tree.
Even severe infestations have little impact on trees because the damage occurs near the end of the annual growing season.
Except in the case of ornamental trees, control is seldom necessary because the damage is generally of aesthetic rather than economic importance."

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