You need to find out where they are entering and exiting your house. Then get a Live Catch Trap and bait it with lettuce or cabbage. Ask around and you may find someone with a trap they can loan you or you can check with your humane society (SPCA) and they might be able to help. Oposum eat just about anything so lettuce or cabbage could be replaced with something else. We had some under the house and put out a trap with a piece of chicken and caught one. We also caught a stray cat and a bunny (with a carrot). But we got 1 adult and 2 baby Opossum as well.
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Is there a home remedy that doesn't cost a fortune to get rid of possums? I have a family of possums that have made a home under and in the walls of the house. Is there a easy way to run them off, a smell or a chemical they can't handle being around? That is really all I know to put down. Please and thank you.
Moth balls scattered where they enter and leave may help. If they are under the house, throw the moth balls under the house in a circle around this area. It may take a few days, but this works on mice and skunks, too.