I’ve literally never seen an animal that did NOT react to gunfire. Even on low pressure, private land, I have watched deer change behavior patterns based on a single gunshot in an area. I’ve seen multiple examples of pigs being shot suppressed and unsuppressed and there is a noticeable difference.
My experience is diffferent. I have noticed no real difference in the reaction of pigs to suppressed and unsuppressed shooting. I have groups shot at suppressed that ran with the first shot and didn't stop anywhere on property and I have seen groups shot at unsuppressed that run a few steps and stopped. On several occasions, I have shot hogs in fields with deer where the deer didn't do much more than simply look up and then went back to feeding (not during deer season). They react, but certainly don't always run or even bother to get up from being bedded. Then again, I have seen deer 80 yards away at a feeder that bolted when I slide the window open on a blind.
Here is a video of me shooting a hog, unsuppressed, with bedded deer in the field. The closest is about 70 yards away at my 2-2:30 position and the hog is about 170 yards away at my 12 o'clock. This was on private land.
135 lb. taken at 170 yards with an Armasight Zeus thermal scope mounted on a 6.5 Grendel AR15 using Hornady 123 gr. SST ammunition in Montague County, TexasM...
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Here is my favorite video of a deer not reacting to gun shots, at least not at first two, LOL. No clue as to the land status here.
LUCKY BUCK
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What I have noticed is that hogs that have not been hunted before tend to react less than hogs that have, regardless of whether one is shooting suppressed or not.
Here is a sort of example I am talking about. The farthest shot here is just 80 yards. First hog goes down and the rest startle, run a little, slow, trot, and then I pop another one 2 times and the process repeats. These are hogs not running for their life because because of the >160 db unsuppressed report of my rifle. They are totally confused as to what is going on and what they should do. The 3rd hog I shot actually came to a stop about 45-50 yards in front of me when I shot it for the first time. This is on private land.
Three sows taken at distances of 40-80 yards using a new Pulsar Apex XD50 thermal rifle scope on a 6.5 Grendel shooting Hornady SST 123 gr. ammo.
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Just as an aside, the optic I used in this video was the first Pulsar thermal rifle scope in the US being tested and these were the first hogs taken with it. A short time later, they released the Apex line that was fairly successful, and then went on from their with their Trail series and things exploded from there.
With all that said, suppressed subsonic certainly shows a lot more promise for not startling animals as much, but the thwack of the impacts doesn't help and there is no way to suppress that.