Cockroaches are nocturnal insects. They depend primarily on sense organs – antennae for detecting odor, and tibiae, which respond to vibration – to find food and avoid predators. Most cockroaches also have sensitive projections, called cerci, at the posterior end of their bodies, which alert the insect to movement too far behind them to be detected by the antennae. Fossil cockroaches have been found dating back to 280-350 million years ago. They have persisted because of their flexible eating habits, their ability to adapt, their flat body which enables them to hide in narrow places, and the strong muscles in their legs which enable them to run rapidly.