Monkey Slug

Subject:  Strangest bug I’ve ever seen
Geographic location of the bug:  Northeast Pennsylvania
Date: 08/22/2018
Time: 04:44 PM EDT
Your letter to the bugman:  Found this crawling on my window. It moves like a slug. When you watch it the whole body ripples to make it move.
How you want your letter signed:  Megan

Monkey Slug

Dear Megan,
This unusual caterpillar is commonly called a Monkey Slug.  Handle with caution as they are capable of stinging.  According to BugGuide:  “Caterpillar is most frequently seen. Bizarre, brown, hairy creature that resembles some sort of aquatic creature more than a caterpillar. Three pairs of long arms and three pairs of short arms, which are ‘deciduous’ – often one or more is missing.”

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BugMan aka Daniel Marlos has been identifying bugs since 1999. is his passion project and it has helped millions of readers identify the bug that has been bugging them for over two decades. You can reach out to him through our Contact Page.

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