Miami University
Miami University: Nuts and Bolts of Classification
Discusses many aspects of taxonomy. Provides a lab activity where students are required to devise a classification scheme for nuts, bolts, and other hardware items.
Education.com
Education.com: Sorting Objects by Material
[Free Registration/Login Required] This game challenges kids to sort objects by material. Taking their cues from the Three Little Pigs, preschoolers will sort items made of straw into one backpack, sticks into another, and bricks into a...