I found a huge pile of feathers today on my front lawn from what appears to be a hawk(?) killed in the past day or two. (See attached photo.) The feathers were spread over a 15 x 15 foot area. I found only one wing, and no head, feet or tail feathers. The feathers had definitely been ripped out in clumps, some with bits of skin attached. The wing primaries were 10 - 11 inches long and the breast feathers were between 1.5 and 2.5 inches long. Anyone got an idea what bird this was? Also, what kills a bird this big? Another hawk? Any guesses or speculation welcome.