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[DaveA]

This is purely a Hypothetical question and desirves like in reply.

If you were to look at historical records of islands (including Austailia), and how the local flora & fauna was and is being basically destroyed by introducion of feral animals such as wild pigs, sheep, rats, cane toads and cats. Then my answer would be Yes. But there is no chance of euthanasia once a feral population is released.