I found this guy downstairs and dead on the floor.

We live in Southern California, Orange County, CA. We have had a week worth of lots of rain that just ended.

As you can see in the pics, he is dark on top half  and lighter color on bottom half. 

What might look like antenna  in the picture is actually hair that was on the floor. Will I find more of these inside my house now that I’ve seen this one? 

What the heck is this?

Thank you so much!

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Dear Michelle,

This looks like some species of terrestrial slug, possibly the introduced Black Slug, Arion ater, which is pictured on iNaturalist (


  • Bugman

    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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