Although I'm an animal lover in general, I do like some less than others (fox and coyote have killed a number of my guineas, so they're not my favorites). However, I do love hawks, eagles, and owls, and agree that they are amazing! (I really love almost all birds). We have a lot of bald eagles in our area right now as they are starting to nest along the Mississippi River nearby....they are really impressive! I do worry when I see hawks or eagles when I've got keets, though. So far I've never lost any guineas to birds of prey. The other day, there were some house sparrows hanging out in the guinea flock. I heard the guineas sound their alarm. When I looked out, I saw a hawk land right in the middle of the guineas and grab the sparrow and take off with it. It wasn't big enough to get an adult guinea but could have easily gotten a keet. There is always some threat that you have to worry about, I guess!
After your post about the fisher, I got curious and looked up some info on them. It looks like they are quite a bit bigger than weasels. One interesting thing I found was that fishers are one of the few animals that actually kills and eats porcupine.....now that's impressive!