In common with other insects, there are three main parts to a beetle's body: the head, the thorax (the middle part), and the abdomen (the back part). On the head, beetles have antennae (feelers), eyes, and a mouth. The legs and wings of the beetle are attached to the thorax. The abdomen of a beetle does not usually have special parts on the outside, but it has the beetle’s gut inside. Like other insects, beetles have no internal bones, but instead have a hard exoskeleton on the outside of the body. The exoskeleton is made of hard plates of chitin.