On an insect, however, the brain is very simple. Insects don't think the same way that you do. They can not imagine or pretend. In fact, insects spend most of their time thinking about what's happening right now. Some insects have mandibles .
Mandibles are an insect's teeth.
Mandibles help an insect chew, cut, grasp, and even crush its food. Mandibles are on either side of the insect's mouth. They move from side to side. Some insects don't have a mandible. They have a rostrum .