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Put a photo of Colonel Sanders next to the fence and see if that gets them to behave 
Hogan
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Be careful what you program. For some reason this reminded me of a comment in the Turbo C++ (yes I'm that old) documentation for the Sound function.
/* Emits a 7-Hz tone for 10 seconds.
<pre>
True story: 7 Hz is the resonant
frequency of a chicken's skull cavity.
This was determined empirically in
Australia, where a new factory
generating 7-Hz tones was located too
close to a chicken ranch: When the
factory started up, all the chickens
died.
Your PC may not be able to emit a 7-Hz tone. */</pre>
ref: 7 hertz - the resonant frequency of a chicken's skull - Everything2.com
"Mistakes are prevented by Experience. Experience is gained by making mistakes."
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So you don't need a fence... 
But In all seriousness 7 Hz is very low frequency, and a normal small camera could never emit this frequency in airborne transmission anyway. Think of a subwoofer, which mind you also doesn't emit much at 7 Hz. The key is the size of the vibrating object when you go toward a lower frequency, as the effective transmission in the low-frequency range is dependent on volume displacement of air.
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Like you don't have enough on your plate.
Time for some extra crispy.
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honey the codewitch wrote: so they're always trying to get out of their run.
So an above ground or below ground problem.
Above ground should be easiest as you can do a visual inspection. Perhaps fencing was not done carefully on a corner.
Below ground involves digging. Perhaps a trench and just move the barrier below the ground. There are other options like stakes or area along fence with larger well packed rocks.
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The issue is there seem to be animals - I suspect raccoons, much as I love them breaching the perimeter. So every day it's a potential surprise, a new escape spot. It's quite awhile to do a full perimeter check, and even when I have, I've missed some hard to see spots.
The solution we're going with is cameras. They don't wander far quickly. All I need to do is as soon as I find they are missing (things get quiet out my window) roll back the cameras and see how they got out.
Edit: They are remarkably stupid animals, with very short memories, and gluttony overrides any good sense they might otherwise have. Ergo, it is easy to lure them back with dried grubs.
To err is human. Fortune favors the monsters.
modified 3-May-23 16:08pm.
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I all seriousness, CodeProject AI Server connected to one of several home automation applications might solve your problem. @sean-ewington has written several such articles.
I have one that trained a model that detected Racoons, Skunks, Dogs, Cats, Squirrels, ...
With the right configuration, you could turn on a bright light, sound a siren, or make a Scarecrow move. The possibilities are limited by your imagination as I believe your fabrication and programming skills are up to the task.
My article:
How to Train a Custom YOLOv5 Model to Detect Objects
Sean's bucket load of articles
Sean's CodeProject.AI Articles
"Mistakes are prevented by Experience. Experience is gained by making mistakes."
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honey the codewitch wrote: I suspect raccoons
Racoons will kill chickens. Which would be obvious. But perhaps they are going for the feed instead. Although seems like that would be obvious as well.
honey the codewitch wrote: The solution we're going with is cameras. They don't wander far quickly.
You would rather chase them around once a week versus just insuring they don't get out in the first place?
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jschell wrote: Racoons will kill chickens
Right but the chickens are locked up in the coop at night when the raccoons are about. I think they're just breaking into the run itself.
jschell wrote: You would rather chase them around once a week versus just insuring they don't get out in the first place?
Ensuring they don't get out in the first place is easier said than done.
To err is human. Fortune favors the monsters.
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Did they saw see Chicken Run (2000) - IMDb[^] by chance?
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
modified 4-May-23 17:32pm.
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Is there a scarecrow to keep chickens in and varmints out?
"A little time, a little trouble, your better day"
Badfinger
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Build a second fence around the coop, and then loose a dog in the outer run.
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Ugh, but then we'd need a dog. The cats would protest, and so would Himself. So would I for that matter. But otherwise, solid plan. 
To err is human. Fortune favors the monsters.
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honey the codewitch wrote: Wyze only works on Android or iOS
The beginning of the end. Simple example, maybe, but it shows that Windows is becoming less and less relevant as time goes by.
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dandy72 wrote: it shows that Windows is becoming less and less relevant as time goes by.
And it is mostly due to windows (owner company) itself
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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My 5G speed is off the scale, but I am now so magnetic I cannot get out of the car.
To err is human. Fortune favors the monsters.
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"A little time, a little trouble, your better day"
Badfinger
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Unfit home fit (13)
In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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Unfit
home IN
fit APPROPRIATE
INAPPROPRIATE
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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Argh! My mind went to uninhabitable which is 13 letters and I couldn't shake that line of thought even though I couldn't get it to fit the clue. It was just too close, in my mind anyway.
Even so, nice clue.
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Maybe if you can delay posting the CCC to 1PM your time, people from the US can also participate  Just a thought...
Happiness will never come to those who fail to appreciate what they already have. -Anon
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And if we posted it at midnight, those in Oz could have a go as well.
You can't please everybody!
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Well if all you foreigners use the correct time that problem would not exist. 
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