I've not used this for 'possum but I have used it when I discovered I had skunks raiding my hives at night.
Crush 3 aspirin tablets, break one egg and place it in a saucer, stir the egg with a fork until the white and yellow are well blended. Add the aspirin to the stirred egg and stir until the aspirin is well blended. Place the saucer close to the hive entrance in the evening(I placed them just beside the front).
If the egg is gone the next morning, repeat the procedure the following evening. It only took two nights and saucers at three hives to solve my skunk problem.
At least on skunks (who love eggs) and cats (who seem ambivalent to eggs) it appears to be lethal. I don't know for sure if it's salicylate poisoning or if it thins their blood too much and they bleed out. It doesnt seem to hurt dogs any. It seems to work on opossums, but I cant guarantee that.
I think it's the "scale" of the aspirin. We used the same sort of method occasionally when I was a kid and raised pigeons. Every once in a while, we'd have a pigeon that would need to be "put down" (injured too badly to survive, serious illness that could infect others, etc.). The easiest way we found was to simply push an aspirin down the throat of the pigeon. Like Michael said so well, they "sleep" forever.
Really, it's an overdose. Three aspirin might not hurt a large dog, but they might kill a lap dog. People can overdose on aspirin and die, too; it just takes a lot more than three at a time for it to be lethal.
Live and learn. I knew aspirin was a blood thinner and some people cannot tolerate it, but had no idea it could be applied like this. I have had no problems with opossums or skunks but it is a good remedy to know.
The redtails never bothered mine either, but a slightly smaller yet stockier hawk we call a chicken hawk. Never seen this hawk unless he was after my chickens(this type caught several of my chickens). The redtails I would see alot perched high upin a Hickory tree hunting or soaring over pasture.
The red-tail gets the blame (it is possible unfairly). I have seen lots of them around and suddenly a bird of prey has gotten 5 of my chickens.
I have been on travel so did not wittness the deed. However, I did install netting over most of the lot to prevent dive bombers
The nice thing about the asprin is it doesnt' really mess with the food chain. It's the right strength to do the job without killing things that will eat the deceased. Rat poison, on the other hand, could set off a chain reaction.
I'd rather shoot them, but waiting all night to GET a shot and then trying to get a CLEAR shot (one that does not endanger anyone or anything else) is often not so simple.
The skunk on this contenent, has few natural predators. The road is probably the biggest killer of skunks. They still need to be controled to some extent. The DNR list's them as a nusance animal, with no limits on killing them. I don't mind doing my share of control when they start eating my bees. Asprin sure seems like the best way.
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