Its a strange fact the slugs have four noses. Actually it is the two pairs of tentacles that slugs have. The first pair of tentacles used to gather information about their environment & to detect lightness and darkness. This pair of tentacles located on the top of the head has a small black spot at each tip. The second pair of tentacles is located at the lower part of the slug’s head. It work as a nose to pick up chemical smells to find food.