Bees vary greatly in size. Some tropical social bees are only one-twelfth of an inch (2 mm) long. Others, such as the leaf-cutter bee, a solitary bee, sometimes reach a length of 1 1/2 inches (38 mm). A bee’s body has a lot in common with the bodies of other insects. Much of it is covered in an exoskeleton made from small, movable plates of chitin. A bee’s body is also covered in lots of fuzzy, branched hair, which collects pollen and helps regulate body temperature. The body also has three sections — the head, the thorax and the abdomen.

The head houses the brain, a collection of about 950,000neurons. These neurons are specialized, and they communicate with specific neighboring neurons. This division of tasks is part of why a bee’s brain, which is a fraction of the size of the bee’s head, can perform complex tasks that might ordinarily require a bigger brain. A system of nerves allows the brain to communicate with the rest of the body.