Defenders of Wildlife
Kids' Planet: Wolf Discovery Curriculum
Here is a wonderful resource for both students and teachers alike! Content includes a wealth of articles on wolves, ranging from vital statistics to hunting techniques, as well as lesson plans and quizzes for kids of all ages!
Other
International Wolf Center: Fun Wolf Facts
A concise site that features "Just the Facts" about wolves. Information such as average length, height, weight, length of life, etc. is shared in this site.