The most humane way would be to shoot it if you can. One shot dead! No messy potions or chemical warfare. Just one shop problem solved!
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Wow - you made that argument way better than I could! The best I could come up with was that the average possum lives 6-7 years and my house has been in the family for over 10 years, so I was here first! But that sounded WAY too childish, so I deleted it, lol!
Where do you get the dry ice from? Is that process kind of like carbon monoxide poisoning? Definitely seems very humane, which is what I'm looking for. I don't want to blast the possum to bits in anger - I just want to end the predator threat as peacefully as possible. I've been perfectly willing to turn a blind eye to whatever roams around out there at night as long as it left my animals alone. This one crossed that line, so it's time to take action. I'm not going to feel guilty about that!
If they are native they have a right to be there. Every animal has a right to life no matter how insignificant the animal is. The attitude if just killing what is bad and dangerous has got us where we are today with some of the worlds largest predators on the brink of extinction.WRONG ANSWER! Do not transport wildlife unless you have contacted fish and game and determined it is legal in your state; transportation may spread parasites and diseases to new areas where they were previously unknown.
Opossums roam downtown San Francisco from time to time; and that area has been developed since the middle of the 19th Century. It isn't always a matter of people moving into where the animals were living, the other way around is just as common. Bambi, for example, loves suburbs because there is no hunting. Bobcats enjoy living under backyard sheds in Bellevue and Redmond, WA, where they thrive on a diet of rats, domestic cats, and small dogs. Coyotes live in downtown LA. Cougars haunt California suburbs, as do raccoons, skunks, and the ubiquitous opossums.
Our method is to live trap, then place two blocks of dry ice in a garbage can and pour a little water on it to start the carbon dioxide gas evolving. I place several layers of cardboard to make a platform for the trap to avoid causing freeze burns to the animal, making sure that there is room for the gas to flow easily around and into the trap. I place the animal, trap and all, in the garbage can, and close the lid. This suffocates the animal and is generally accepted as humane.
Nitrogen gas is even better, except for those burrowing animals who are capable of detecting lowered oxygen levels.