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Huge yellow slug :) There are three banana slug species in California: Ariolimax columbianus (Pacific Banana Slug), A. dolichophallus (Slender Banana Slug), and A. californicus (California Banana Slug). I don't know which this one is. The location might be the best clue, but I couldn't find detailed descriptions of the species' respective ranges online. Can anyone help me out?
Redwood forest floor. Butano State Park.