A new predator enters the area, population shrinks, Heavy rain increases plants, population grows, Disease spreads, population shrinks, More space becomes available, population grows, More food becomes available, population grows, A drought lasts for many months, population shrinks, The temperature becomes very cold, population shrinks, Water sources dry up, population shrinks, More sunlight reaches the area, population grows, A flood destroys nests and homes, population shrinks, Predators disappear from the area, population grows, Another species competes for the same food, population shrinks, Medicine becomes available, population grows, The population moves to a safer area, population grows.

Populations increase / decrease

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