One shot, one kill.
Somebody might hear the first shot but not really be sure what it was, especially with everyone's windows closed for winter. They will listen carefully for the sound again and might recognize a second shot. They might also look around so don't stand over your prey with a gun in your hand. Wait a few minutes and go out later to admire your kill and skin it for Thanksgiving dinner.
Exactly, when I found out about the ticks I put them on my no shoot list. Trash pandas still get relocated to TP heaven.
Subsonic rounds out of a 24" Marlin 39A are close to or equal to a suppressed semi-auto.
Possums are harmless. They may snarl but you can just walk up to them and grab them by the tail and fling them if they're somewhere you don't want them to be. But as people have said, they're better to have around than not. Like rat snakes.
As far as Colibris go, I got a box many years ago when all the Aguila stuff first hit the U.S. market. I'll never forget my first Colibri shot. It was out of a 10/22 and I shot an empty glass YooHoo bottle at about 10 feet. The round bounced off and the bottle wasn't even chipped. There's no way I'd ever fire one of those at something living. It'd just be cruel.
I've also never killed a opossum since I found that out either.
My Jack Russell/beagle mix showed her dark side on a opossum not too long ago. The swiftness and violence of it shocked me. That thing was dead before it even registered that it was there.