I hit a ground hog once at a driving range, intentionally too. He was about 220 yards out, and I got in a consistent groove where I was hitting the ball within a very tight area. I told my brother that I was going to hit him, and 2 or 3 shots later I put one into his ribs after one bounce. He looked up like "wazzat?", then resumed grazing.
Definitely displayed my lack of power, as well as his indomitable spirit and calm demeanor.
I don't recall hitting any animals while playing golf, at least not other than myself with a few richochets. I have won the "Beaver Pelt" competition a few times, though.
I have had to tee off with an about 8' gator catching some rays in front of the ball at the edge of the tee box, I just prayed, "Please, Lord, get this ball into the air" - one of the few times G*d has not shown his warped sense of humor with me on the golf course. Two weeks ago I saw my first ever panther on a golf course. He was about 50 yards away in some tall grasses, watching us tee off. He was beautiful, and I'm a sucker for stray cats, but he had me much more nervous than any gator I've ever come across. We called it in to the pro shop so F&W could take care of the guy - there are only something like a couple hundred left.
As for me, when I'm playing and want to miss something, I take dead aim at it.
But, this guy made no question of his intention to hit the bird while having professional skills to do so.