Great thread, Patrick!
The only thing I have to offer (besides about a half a million times the squirrels or tweety birds tellin' on me) on this subject:
I believe it was Saxton Pope's book "Hunting With the Bow & Arrow" where he was talking about hunting with Ishi. (Someone, please, correct me where I get parts wrong) He said that they had paused their still-hunting to listen to a squirrel (or a bird, I can't remember which) making a fuss. Pope asks Ishi what the commotion is about. Ishi replies with something to effect of "Our friend the squirrel is scolding a fox, for being too close to his tree." Pope didn't believe that Ishi knew exactly what the squirrel was saying, so they stalked over to the tree in question, and sure enough, there was a fox near it's base. I thought this story was pretty awesome.
My own personal story, that stands out the most is:
Before I had switched full-time to trad equipment I was still-hunting through an area of a local military installation, and spotted a group of does moving leisurely west about 100 yds. to my south. I noticed the the wind was coming from a mostly south direction, so I decided to give a stalk a try. I don't think I had even moved 10 yds. when the does blew the alarm 2 or 3 times and then exploded out of there to the southwest. I was baffled! I stood there for a long time thinking, "What the hell did I do wrong THIS time?!?!?! The wind was in my face, and there was NO WAY they saw me yet!" I gave up trying to figure out how I screwed up and started to head back west, when I heard a squirrel raising a ruckus just 30-ish yds. ahead. Again, frustrated, I threw my hands up and thought, "I might as well give up today! I can't do anything right!" Then I noticed that the squirrel was in plain view, but facing his vicious bark toward the base of his tree, and NOT towards me. So I sat tight waiting to see what it was that had the little fella so wound up. In short order, I spied one of the fattest bobcats I have ever seen (how he got to be so fat, I really don't know because he seemed to be an even worse hunter than me! LOL), making his way north. I did my best to judge the distance and raised my (unmentionable) bow. Then I realized that I wasn't sure if bobcat was in season, so he got a pass. When I got back to my vehicle, I looked in the reg. book and found that the season had just recently opened....
If only I had been better studied in what critters were legal to kill, and had the skills that Ishi possessed, I would have known what the deal was all along and would have gotten a fine pelt that day.....