Spiny oak slug caterpillar

Woodlands, forest edges, gardens, and other areas with broadleaf trees and shrubs, especially oak-associated vegetation.

The caterpillar grazes on leaves, often creating irregular skeletonized patches. Adults generally do not feed or take only minimal nectar.

A slow-moving, slug-like larva that clings tightly to foliage and uses urticating spines for defense; it pupates in a hard, seedlike cocoon.

Spines can cause painful stings, itching, or localized dermatitis, so avoid handling. It is a native herbivore and part of woodland food webs, though occasional infestations may damage foliage.