|A congregation of Great Egrets congregated in Horicon Marsh National Wildlife Refuge, Wisconsin; 10/2/2011.|
|Egrets, American Coots, and White Pelicans enjoying a sunny afternoon at the Horicon Marsh NWR, WI; 10/2/2011.|
|A graceful Great Egret flew past me, HMNWR, WI; 10/2/2011.|
|Another Great Egret flew past me for a perfect photo in the morning light, HMNWR, WI; 10/2/2011.|
According to whatbird.com
a collective group of egrets can be called a "congregation", "heronry", "RSVP", "skewer", or a "wedge" of egrets. I don't make this up, folks.