Not sure this is relevant, but I'll contribute it anyway.
I raised rabbits for about ten years (just ended that project recently, actually). I kept them in a large lean-to addition on a detached garage. The first year I had them, the does killed nearly every litter they had. I finally figured out what it was: I also stored firewood in that addition, and I would haul the bucked logs to near the shed, then split them with a maul and stack the splits inside. Once I started splitting in the woods before hauling the wood back, the killing stopped. It was the sharp repeated noises.
The rabbits always tolerated the noise of our tractor without issue.
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