A couple of photos from Trout Lake in Yellowstone. No otters but a couple of cooperative waterfowl. I hadn't noticed the serrations on the golden eye's beak before - the better to hold the fish, I guess.
Pappa Smurf, what you call a "Sparrow Hawk" looks like a juvenile Cooper's Hawk to me. They're quite common where I live. Here's a juvenile that I photographed recently.