i haven't seen any flying around my yard but i have noticed that we now have
Peregrine falcons in the area. My last job was for a pharmaceutical company in my city which is on a huge complex. one day as i was walking to my building this huge shadow went over me. i was totally confused and when i looked up i saw this HUGE bird. i was like WTF? 
i saw them a lot more on the complex when i actually started looking for them. i was amazed. Those are the only big birds i have noticed in my city. However on the side of the city where i live there is a mountain which is being turned into residential areas (which we all hate). a lot of the animals have been coming down off the mountain (deer, bears, fox, coyote) and i heard that there are other birds of prey. i haven't seen them tho. needless to say, morgan never goes out in the yard alone.