Thanks, all! Black vulture makes sense, and in discussing it with my wife (who saw the bird and snapped the picture), she seems to recall a featherless head, which would pretty much clinch it. Turkey vultures are fairly common around here, but like RobinHood, I'm puzzled by the location for a black. iBird shows the distribution far south of Michigan, though https://www.allaboutbirds.org/guide/Black_Vulture/id says " Black Vultures have substantially increased their range northward in recent decades." Has anyone else seen them this far north?