This is a slug. Slugs are gastropods. They are related to snails and mussels. They live in oceans, lakes, rivers, and on land. Their slime trail helps them get around and often times helps protect them from predators. This slug was about four inches long!
Clue #1 I am slimy.
Clue #2 Dave almost stepped on me.
Clue #3 I am related to snails.