99.9% of all negative encounters with critters have something to do with them wanting your food. If you follow the basic rules of food storage at night you'll have very little problems with any critters.

Bears, coons, wild pigs, skunks, squirrels, birds, etc., will make a mess of your camp if you have food laying around or if there are a lot of food smells in your camp.

Big cats, gators, coyotes, deer, bison, wolves, etc., might keep you up at night but probably won't come near you. You would have to present a significant threat for them to give you any trouble. Note: Coyotes are the rudest, loudest, most irritating little SOBs in the world at night, but they are not aggressive towards humans.

Snakes, scorpions, spiders, etc., you just have to keep an eye out for. Shake out clothing that's been left outside.