Around noon today I was out in the back garden. I heard a lot of splashing about. I looked up and saw three of these things taking turns in one of SWMBO's fountains. They looked exactly like this photograph and were about two feet tall. They observed me for a bit and then flew up to a fence near the fountain where they perched side by side and peered about. They looked slightly confused. The white legs are very distinctive. My wife came out of the house to take pictures of them on the fence. She approached to within ten feet before they became flustered and flew into a tall tree in the next dor neighbor's yard. They sat in a row high up and squabbled with each other for a while before flying away. They are clearly immature.
Twenty years ago I had an office on the tope floor of an office building in Clarendon (Arlington). A pair of big turkey vultures used the roof as a perch and observation post to survey the streets. They had red heads and were about four feet tall. I often tapped on the plate glass wall that looked out on the sloping metal roof. When I did that one would sidle up to the glass and peer in at me. These are not pretty birds. pl