Red slug

Up until 15 cm long and 2 cm wide. This was brick red but they can also have other colors. The red slug, like all other slugs, uses two pairs of tentacles to sense its environment. The darkly-coloured upper pair, called optical tentacles, is used to sense light. The lower pair provide the red slug's sense of smell. Both pairs can retract and extend themselves to avoid hazards, and, if lost to an accident or predation, can be regrown.