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I've staked out the same area before but never at night. When I finally took a night trip I found tons of these guys, big and small Nocturnal slugs, 15mm-75mm, pneumostome on right side. If my ID is correct, these specimen represent an invasive species from Europe, the only nearby place it has been seen (according to distribution maps I've found) is in Kentucky, but since Nashville is right by the border, it's plausible that the population has spread further south.