Correction: This species is a dorid, not an aeolid. The appendage is a gill plume used for respiration—not a cerata. Unlike other mollusks, these colorful sea slugs don't have shells or gills. | National Geographic

Banana slugs are equipped with 4 sensory stalks, 2 eye stalks, and 2 chemical receptor “taste” stalks. They eat using a set of iron imbued scrapers known as a radula. The hole in the side of the head is called a pneumostome, it is where they breath and breed. .They glide around on a layer of water loving (hygroscopic) slime that serves not only as their way of getting around but also as a defense against predators (licking a banana slug is not a pleasant experience). The slime also carries hormo