Well, a Little Blue Heron is a MUCH greater rarity than Green Heron in DC!
In fact, a bird many DC listers would "twitch" so hope it stays around.

DC has an odd list of "desired rarities" which include such "cripplers" as
Mute Swan and Cattle Egret...

Gail Mackiernan
Colesville, MD

on 04/17/2009 12:53 PM, Thomas Jones at  wrote:

> About noon, there was a little blue heron in breeding plumage perched in a
> tree near one of the small ponds to the left of the visitor center at
> Kenilworth Aquatic Gardens in D.C.  Thanks to the leaders of a boy scout troop
> for alerting me to it.  I was hoping to see a green heron, but didn't.  Not
> much else of note there.
> 
> Tom Jones
> Washington, D.C.