The Exploring Nature Educational Resource site (www.exploringnature.org) is intended for grades K-8 and features a searchable database of more than 1,000 animals categorized by classification (mammals, birds, etc.), by trait (scavengers, carnivores, etc.) by habitat (rainforest animals, desert animals) and by geographic location. Additional resource databases include plants, trees, biomes, and the human body.
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GuysRead.com, Jon Scieszka. http://www.guysread.com
Gale Virtual Reference Library http://www.gale.com/gvrl/