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Species: Ariolimax columbianus 

Common name: Banana slug
Family: Ariolimacidae 

Lateral image of a spotted Ariolimax columbianus
One of the largest slugs in the world, banana slugs are an iconic species for the Pacific Northwest. They come in a variety of colors: yellow, green, gray, reddish brown, and even white. All forms are found with and without spots. 
Origin: Pacific Northwest
Diet: Dead plant material and fungi.
Behavior: Known for gnawing their mate’s penis off after mating.
Where in Oregon: West side of the Cascades to the coast, and Umatilla county.
Similar exotics to look for: None 
Dorsal image of a spotted Ariolimax columbianus
Lateral image of an unspotted Ariolimax columbianus next to a quarter. Adult size ranges from 180 to 260 millimeters
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