Food Web Balance
Plants, plant-eaters and predators keep each other in check, so adding or removing one species ripples through the whole food web — even to species it never touches.
BiologyAges 8-13~10 min🎙️ Voice tutor
Play freeNo account needed
What your child will figure out
- Keep a living food web alive for a year by releasing and moving animals, and read the population chart as evidence.
- Explain how a missing predator lets plant-eaters boom until their food runs out.
- Trace a ripple across several feeding links, such as herons → frogs → snails → algae.
- Transfer the idea to a new web: bring back wolves to save beavers they never eat.
The levels
- The foxes are gone
Keep grass, rabbits and foxes alive until winter after the foxes vanished.
- Herons moved in
Keep algae, snails, frogs and herons alive after a heron flock arrives.
- Rescue the kelp forest
Bring sea otters back and stop the urchins turning the forest into a barren.
- Save the beavers
Transfer: save the beavers in a Yellowstone valley where the wolves are gone.
Ready when they are.
Play Food Web Balance free — no account, no card.
Play Food Web Balance free