There's a range of hawks around here, including turkey vultures. First things first. Turkey vultures are not hawks. Nor do turkey vultures attack, scoop up, or eat mammals. However, black vultures have been known to grab cats.
Black vultures are a more southern species and have been almost unknown in New England.
However, in the past few years, they have been showing up. We seen them in Ridgefield and they are often spotted in Litchfield County now. As for the rough-legged hawk, this species lives across the lower 48 states in the winter, heading for the Arctic breeding grounds in summer. According to a study of birds seen at Sherwood Island State Park in Westport, they are considered rare hereabouts. The Wild Bird Center will be doing regular bird walks on the third Sunday of the month, starting in November.