from http://science-class.net/archive/science-class/Biology/Classification.htm
These resources are generally appropriate for grades 5 - 9. In some cases they have been classified by grade level.
The groupings are general and somewhat arbitrary. As with anything in education; your milage may vary.
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Mostly for Teachers
Mostly for Students
Middle School
How are living things classified into groups?
For Teachers and Students
Groups of Animals (The Open Door)
Biodiversity (The Open Door)
Collecting, Describing & Classifying(The Open Door)
How Biologists Classify Species (The Open Door)
Putting Things into Groups 1 (The Open Door)
Putting Things into Groups 2 (The Open Door)