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Yes, most happen at night, often just after dusk when nocturnal predators are starting to hunt. But it depends on the predator. Night hunters primarily racoons, oppossum, rats, cougars, owls, bobcats, bears. Day hunters hawks, dogs, cats, Dusk, Dawn hunters fox, coyotes. Always hunters snakes, cats, man. These are generalities. But off the top of my head that's close. Also eagles don't eat much chicken, east of the Rockies their diet is primarily rabbits, large rodents, fish and carrion
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When they free range (which is what chickens love to do) they are vulnerable to everything. When locked up in the coop at night they're safe IF nothing can get in. Tiny holes can be trouble. You need big ventilation so never use screens rather durable metal hardware cloth firmly attached all around. This goes for all vent openings. To prevent digging under the run fence I use either a concrete foundation or large 18" paver stones along the outside of the fence and check often for digging there. Some use an electrified wire just outside the run near the base.
From above I cover the entire run with woven wire fencing or galvanized roofing for the areas I want to keep dry.
If you need to span a large area you can use 1/2" emt tubing (thinwall conduit) spaced and if necessary supported with metal fence posts or in my case (7" high pen) 2X3 studs. They don't even have to be in the ground. I just drill a hole in the stud just larger than the tubing and slide them over and let them free stand.
It's brutal to make these modifications in winter but dress warm and get out there.
Good luck to all.