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So can you explain how a number of escaped pet-trade ferrets can grow into a force that can threaten an ecosystem when they are unable to increase their population size?

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You need to think bigger. There are several ways. Eating all the remaining individuals in a local population of an endangered animal until splitting the species in two isolated areas unable to survive, would be the obvious one.

For example, a professional of ecology would ask him/herself questions like "are the Parvoviruses of asymptomatic ferret pets unable to increase their population size"?

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