The Black Slug is a mollusc also known as the Large Black Slug and the European Black Slug. It is usually black, but sometimes it can be a brownish orange colour. It is coated with thick slimy mucus to stop it from drying out and this mucus is quite difficult to wash off if it a person comes in contact with it.

The Black Slug can stretch its body out to a length of ten to fifteen centimetres and when it feels threatened, it can close its body up to nearly the shape of a ball. The front part of its body is smooth-looking and the rest of its body is covered with knobbly-looking vertical lines. It has a round breathing hole on the right-hand side of its body and a black fringe around the bottom of its body. It also has two tentacles at the front of its head to help the slug to find its way in the dark.

Black Slugs usually hide under soil or debris in the day, but they may come out on wet days. They can normally be seen at night when they go looking for food such as plants, vegetables, dead animals and even dog poo! The Black Slug moves around by using a large muscular foot underneath its body and as it moves it secretes mucus. Trails of mucus can often be seen and Black Slugs often use the same mucus trails to find favourite food spots.