I'd suggest hanging a bird feeder and leaving the lids off the garbage cans. That works about a hundred percent of the time no matter where you live.

If you're talking about a trail camera in the woods, I'd try corn for squirrels. Raccoons have a big sweet tooth. Trappers use everying from marshmallows to honey to powdered donuts. Oily fish and fish oil work too. Possums are pretty much attracted to anything.

Every winter I put a camera over a deer gut pile or two. I almost always get photos of possums and raccoons. They are both pretty omnivorous.

I'll second allegmtn! Lid off trash can is the best attractant known to man!

Every bait pile I put out for deer bought in coons, possums, skunks, ground hogs and squirrels. My trail cameras got photos of all of them eating at the bait pile.
I use corn, apples, sweet potatoes, donuts, sticky buns, rolls, sugar beets, bird seed, mineral block, horse feed and pour a gallon of molasses all over the bait pile.
Bon Appetit!

jhjimbo, LOL

Sliced fresh peaches work well for trapping raccoons in live traps when suspended from the top to keep them free of ants.

for coons and possums i use a mixture of brown sugar molasses with fish oil and dry dog food, I roll the biggest marshmallows i can find in that mixture

Opossums like fruit plus any of your food scraps just throw them out and wait.

If you want to see what deer are in your area.I put a 4' 2x4 part way in the ground and load it up with cheap peanut butter just for Ss&Gs and watch the Does fight over the Peanut butter on a stick!!!

Hi...

For squirrels...most nuts, including peanuts, and peanut butter. Also sunflower seeds.

'Possums will come to a mouse, a sardine, almost any 'smelly' meat, cat food, etc. Persimmons are also a favorite.

'Coons like sweets (honey, marshmallows, etc.). Also fish and shellfish.