Yellow Banana Slug

The Pacific banana slug is the second-largest species of terrestrial slug in the world, growing up to 25 centimetres (9.8 in) long, and weights of 115 grams (4.1 ounces). (The largest slug species is Limax cinereoniger of Europe, which can reach 30 centimetres (12 in) in length.)
Banana slugs can move at 61⁄2 inches (17 cm) per minute.
Slugs use two pairs of tentacles to sense their environment. The larger, upper pair, termed "eyestalks," are used to detect light or movement. The second, lower pair are used to detect chemicals. The tentacles can retract and extend themselves to avoid damage.
Banana slugs have a single lung which opens externally via pneumostome. The pneumostome lung cavity is heavily vascularized to allow gas exchange. Dehydration is a major problem for the mollusk. Banana slugs excrete a thick coating of mucus around their bodies and can also aestivate. They secrete a protective layer of mucus, and insulate themselves with a layer of soil and leaves. They remain inactive in this state until the environment is moist again.