National Zoological Park Home Page -Contains educational games and a Real Audio lecture center. The site is well-presented and informative. If you visit, check out the "Think Tank."

Welcome to the Virtual Zoo- Designed to bring a virtual zoo to anyone with access to the internet, regardless of their location in the world. It divides animals into mammals, reptiles, fish (ocean creatures), amphibians, and birds 

Classifying Critters- Describes how scientists classify the earth's vertebrates; provides a brief description of what species, genus and family mean; and gives students hands-on practice for classifying and describing animals.

Kidport, 6^th grade, Science: Vertebrates
An interactive quiz and questions on vertebrates.