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Great site if your students wanted to find out more about worms (decomposers in the food chain).

Excellent Harcout interactive has students drag pics onto a food web showing the food chain. Three webs: meadow, arctic, pond Suitable for elementary and middle school.

Wiki page on Food Chains I created for a grade 4/5 class. Includes a Sqworl page of student activities.

Great game provides a bit of description and then students choose to assemble food chains in either a northern or a forest biome.

Great sub-titled video with pictures and song created by a teacher. Explains the food chain and calorie transfer from one level to another. Suitable for upper elementary or middle school.

Excellent video for younger children from Simple Science explains habitats, predator/prey relationships, and simple food chains.