Food Web Building Kit: a food web group activity. Food webs and food chains can be easily created using the six steps that are detailed in this package. It also has everything you need to make your own food chains and food webs.
Food Webs: Free Food Web Posters - 6 Steps for Making a Food Web. These are detailed posters which explain the six steps I have practiced with my students over the years for making food webs. (This is an excerpt from my Food Web
The Science Penguin: Teach It: Ecosystems and Food Chains Third Grade: Being part o a group helps animals obtain food defend themselves, and cope with changes. Groups may serve different functions and vary dramatically in size.
From Mystery Science: Food Chain Activity - free hands-on science activity for and grade elementary kids. Part of a complete unit on Ecosystems: Ecosystems & the Food Chain. Meets Common Core and NGSS.