A reader recently asked us “what kind of worm is this?” She was referring to a creature featured in the accompanying photograph. After glancing at the photo we are sure she has discovered a caterpillar, not a worm. Caterpillars are the larval form of moths and butterflies.
This caterpillar is light brown on the topside, and has a pattern that slightly resembles tree bark (probably to help camouflage). Its underside is dark pink. Based on the great photos provided by our reader, we can identify this as an Underwing caterpillar in the genus Catocala. It will eventually become an Underwing moth.
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In summary, our reader sent us in a photo of a creature that we believe to be an Underwing caterpillar.
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