Insects are small animals with six legs and a hard outer shell called an exoskeleton. Most insects have wings and a antennae. Insects are the largest group of arthropods.
In the United States, the number of described species is approximately 91,000. Insects can survive almost any place where food is available. Insects can be found in cold regions, hot rain forests, deserts, mountains, caves, and freshwater. Most insects hatch from eggs. All insects lay eggs.