I worked one summer for the University of Montana doing bird research in northern Arizona (got to live in a tent for 4 months on the Mogollon Rim, so that was cool). One day I was tracking a hermit thrush (smallish brown bird that, as the name implies, likes to hide) trying to find its nest site. After 4 hours of following this bird around, I was pretty sure we were circling in on its nest, and was looking forward to end this overly long track. All of a sudden there was a loud whooshing noise in the woods, and out of nowhere a sharp shinned hawk came swooping in and obliterated the thrush in a spray of feathers. I was so pissed at that hawk. I got to see her a few weeks later, though- we had a crew on that study plot mist netting, and I was checking in on them when they caught the hawk. They are all sharp claws and razor beak- pretty awesome sight. It took four of us to disentangle her and hold her for measurements.