What in the world?!

Seriously -- what in the world is this? A crane? A heron? I'm terrible at ID'ing birds other than blue jays (they're blue, duh), cardinals (they're red) and robins (they have orange heads).This guy was hanging out by the creek along South Lindell Road and Walker Avenue in Lindley Park around lunchtime today. I was driving by, stopped in the middle of the street and took a few pictures. He didn't move -- he turned his head a couple of times but didn't go anywhere. I've seen birds like this in the Arboretum, which is a little farther north from where this guy was, but never seen them south of Walker.
Anyone know exactly what kind of bird this is.
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