Most images in this article are linked to more information. A group of children are busy playing in the park. They look up as a tough-looking boy approaches. The other children flee in search of another place to play. Every playground has its bullies.
Many animals behave the same way.
Biologists at Arizona State University hope that by learning more about animal behavior, they will also be able to understand why people act the way they do. Michael Moore is a professor of biology and an expert on animal behavior. He and others in his laboratory think that hormones are part of the answer. Moore and his partners study hormones and behavior in tree lizards . If you live in the Phoenix area, you have probably seen these lizards in your own back yard.