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Orgyia leucostigma
The white-marked tussock moth caterpillar is easy to identify. Note the red head, black back, and yellow stripes down the sides, and you'll be able to recognize this stinging caterpillar. Many tussock moth caterpillars, including this one, are considered tree pests due to their ravenous and undiscriminating taste for woody plants.
Spotted on the foundation of my house.