← Things That Run · Lesson 2 of 3
A food web
A food web shows who eats whom. Plants make food from sunlight; rabbits eat plants; foxes eat rabbits. Each arrow is a link.
Change one link and others move. If the foxes vanish, the rabbits may grow in number and eat more of the plants. Scientists studying the return of wolves to Yellowstone in 1995 have argued for years about how far effects like this spread, which is a good reminder that a web is easier to draw than to predict.
In a simple web of plants, rabbits and foxes, the foxes disappear. What is most likely to happen first?
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