Having a safe coop and run, and only having food in those places, makes all the difference.  Many of us underestimate what 'predator proof' really means, and find out the hard way, with dead and dying chickens.  Don't do what we did until we learned better!
Opossums, skunks, and raccoons aren't a big threat to free ranging birds during the day, but all will have no problems killing birds at night.
Only trap if you will then shoot!
Opossums carry a parasite that's very dangerous to horses, raccoons carry a roundworm that can kill humans, and both skunks and raccoons are sometimes infected with rabies.  In addition to other not so nice diseases.  Having any food for them near the house is a bad idea!
Here I do like to feed the wild songbirds, but will stop feeding when these critters show up, until they move on elsewhere.  Any food left outside will attract them, never good.
Wildlife needs to be wild, not dependent on handouts in your yard!
Mary