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There was a JRE episode with a coyote expert who touched on this. It was relatively easy to eradicate wolves, because they have a strong pack mentality and will stick together even as members die. Pigs and coyotes would disperse into groups of two and three, widening their geographic range and still breeding.

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Yes, but they are going to naturally do that anyways. If a specific area can only support, say, 100 pigs and they keep breeding and breeding, some will have to spread out to other areas to find food. All animals do this. They will expand their numbers and geographic range until they hit a limit based on access to resources or predation.

If the options are declaring open season and not doing anything, you are correct that open season may be better (I say may because I do not know about feral pigs breeding patterns, etc. For example, some animals do not breed when they have a young child, so separating them from their children will have an opposite effect). But there is a third option that is better than both and that is having professionals do the eradication.

If your concern is limiting the spread of an invasive species to minimize the damage they produce on the environment, then furthering their geographic spread is not a good idea. Coordinated campaigns to clear out entire groups would be good, teaching them to run from hunters and spread out would be bad.

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