Before we begin, please read this:
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Now, I'm in the egg business, and possums have killed several of my chickens in the past. So in a sincere answer to your question, yes they are a nuisance animal. My total count this year is 31 between me and the dog. We make a circle every night about 10 to check on the birds and make sure there aren't any critters around. They're also quite fond of my gardens (the produce from which contributes to our household income), so they cost me money there as well. Sadly, a lot of folks like to pity Mr Possum, but he'll find no sympathy here. Just lead.
Mac