What kind of Heron?. . .Paulnj

[gahspidy]

This is a shot from about 7:00 AM at the Marine Park Nature Preserve. Not such a good shot, although i like the rock textures. I could not get closer than this to this bird. I spent so much time waiting for it to get "used" to me being there. It was fishing in the marsh water just below these rocks and as I inched up it finally flew up to the rocks. So I grabbed a shot for my efforts and left it be.
It seems to have the markings of an American Bittern, but this bird was only about 8 inches to a foot from head to toe as seen here. Maybe a Least Bittern? Green heron?
Still looks to me to have the markings of the American bittern, but a bit small for one.
What do you think?