egg eaters:
Snakes
Squirrels
Chickens
Ravens
dogs
Rats
We have ground squirrels they can dig their way in. But can get through a hole the size of their head.
Snakes.... There are species of snake that only eat eggs. Then there are egg opportunists. I have had em come in dine on finch eggs then couldnt get out because they were too fat. Garter snake through half inch wire.
Rattle snakes will NOT eat eggs not adapted to it dont recognize them as food.
http://snakesarelong.blogspot.com/2012/06/egg-eating-snakes.html
Chickens will eat eggs if they start out lacking something in their diet. Once they start they dont stop. A dark nest helps...
I have had ravens walk in through the pop door and walk out with an egg.
And of course dogs or Canids Fox Coyote .... But the real danger from dogs is they prefer chicken.
BEST defense is to harvest eating eggs. Place Broodies in their own special extra secure enclosure.
Roll out nests are an excellent deterrent... for all conditions.
But if something is coming in YOur chickens are in danger... Best reinforce the coop
I too prefer to not kill only deter. I prefer not to relocate. either unless its a rattle snake.
Active deterrent:
Hot wire is an excellent deterrent for most mammals... Low for diggers Higher for jumpers and climbers. Predators that find out the fences bite... stay away but keep their territory which gives the added benefit of not having to teach a new predator.
Passive deterrent:
Good stout wire that cannot be reached through I use four gauge aviary wire.
Aviary netting for Over head attack.... Cats of any kind wont walk on surfaces that give.
Coyote fence... fence that has rollers on the top. works for cats and dogs too.
my worst predation issue was from local or feral dogs.
That leaves rats.... Which I will kill. If you see one there are at least five more minimum. They cannot get through half inch wire but they do use tunnels left behind or dig their own.
There is a poison that is not dangerous if a snake eats a poisoned rat... Its made from corn.
http://myhousepests.com/rats/natural-rat-poison.html I bought some at the feed store and it works.
deb