I think carabiners are one of the best things that a raccoon cannot figure out!I might have a suggestion to that problem. I use a hasp latch set with a carabiner...
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I don't know if any raccoons have tried to get into my coop, but they would have to figure out how to open the carabiner and remove it. So far, 4+ years, no raccoon attacks...
I live on a lake and we have Bald Eagles and hawks overhead all the time. I cannot let my chickens free range. I have a nice sized chicken run and just stretched bird netting across the top. Bird netting is inexpensive, and I have never had an attack. I'm sure they see the netting and just go elsewhere for a meal.
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Sorry you have such a bad predator problem.
Hubby likes magnets though. He put 90# magnets on the four doors inside the 12x20' breeding coop, then we talked about what to use for the outside. We have seen just about everything up to bear even here.
He wanted to do magnets on the four outer pen doors, so I said fine, but let me research a raccoon's pulling ability as I initially didn't think magnets would work on an outer door where predators could be roaming around.
It seems most raccoons pull very little, up to around 20# or so. There was one story about a raccoon pulling a 40# bag of dog food across a yard. It was struggling but doing a good job of it. Now, that is rare, but still, I want to be sure we don't wind up with a talented raccoon getting into our chicken pens.
So, he had me order more magnets, this time, two 90# per door. He said I should still be able to open the doors even though that's a combined pull force of two now. It's tough actually. I have to pull pretty hard. He reinforced the doors to withstand me jerking to get them to open. As I keep doing it, I'm sure I'll get a strong right arm. Nothing can get in those pens, albeit a bear.