Just thought I'd toss this into the ring for some consideration. The only times I've actually been fearful of something nasty happening to me when it came to animals in the wild were incidents involving Whitetail Deer. I used to do some guiding on a 3500 acre hunting preserve here in Pennsylvania, and twice, within a week, during the rut, I had bucks come in toward me and a client. Both times, the bucks ears were laid back flat against its neck, walking stiff legged, slow and very deliberate. The one buck got to within 10 feet of us before my client decided to shoot the damn thing. I asked him why it took him so long, and he told me he thought I was just building up the threat so he'd have a story to tell. He said he never heard of deer becoming agressive. Turned out this was the first time he ever went hunting.
The other buck incident occurred not 100 yards from the one mentioned above. In that case, we were walking back to the Bronco when we observed a nice 10 pointer walking toward us, exhibitting the same agressive behavior. We got into the Bronco, and then the buck charged the driver's side door, and ran its antlers through the side of the door, tearing my pants.
I guess we have to include Bambi in the group of dangerous animals now.