Food webs are abstract concepts that some students have trouble with. IF we had visual models of the organisms in the food web and they were able to get connected in a 3D space (like tinkertoys), students could actually build the webs and visualize the relationships.
How this would look - A set of organisms and connectors. The organism models would be a uniform size and have 14 holes "drilled" about them in two intersecting planes where connectors could go.
Problem - this product does not exist!
Solution - Enlist students to design and print the sets in 3D!
Stay tuned.....