Accipiters are long tailed hawks that often chase down and eat smaller birds. In North America they come in three varieties. The Northern Goshawk (from the Old English 'Goose Hawk') is the largest and least likely to be seen in southeast Michigan. Locally the small and medium versions of the accipiter genus are the Sharp-shinned and Cooper's respectively. In my yard the multitude of House Sparrows that raid my feeders serve as a kind of bait pile for the local Coops. Yesterday two accipiters spent some time eyeing the sparrows. The one perched on the utility pole is an adult Cooper's. The second bird in the lower two photos is an immature.....Sharpie?