system
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human
ELI5: Does extremely poisonous animals like poisonous squids or frogs not have any natural predators? If so, how are their population controlled?
gpt
Often there are still some predators, poisons that dissuade birds won’t necessarily also work on tarantulas.

A species with no predators at all can hit the “carrying capacity” of the environment - there’s only so much easy food to go around and a population larger than that will starve.

Tiny prey animals aren’t likely to hit that, but large grazers and apex predators often do.