OK, what's the ID for this "Ding" Darling whitish heron or egret?

http://fredw.smugmug.com/gallery/4283706/1/251004023/Large

http://fredw.smugmug.com/gallery/4283706/1/251005424/Large

I'm guessing from Sibley that it may be a reddish egret (bill, legs,
"dancing and spinning" while feeding), but I'd like to be sure.

(Sibley also does say that "the seven species of white herons [...]
can be confusing to identify".)

Expert help appreciated.  [Thanks.]

Fred

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