It is a Great White Heron. We have lots of them here in Central Florida.
This absolutely rocks!
Shadows on Half Dome by Mike Day, on Flickr
Uh, oh. We've had a Great Egret and now a Great White Heron.
Anyone else want to chime in?
The egret has a boxy "thing" on the underside of its neck. We have a lot of egrets here in the coastal VA area. We also have blue herons. My vote is that it is a white heron.