Of the three white egrets that breed in New England (American, Cattle, and Snowy) the largest is the Great Egret, which I persist in calling by its old name, American Egret.
A reader sent in these photos of one from this weekend in salt marsh in CT. You can see some of their fancy breeding plumage, for which these birds were hunted to near-extinction through the 19th and early 20th Centuries until the Audubon Society was created to protect them. More about the Great Egret in CT here.
The populations recovered fairly well, as long as they have safe places to nest in their tree colonies - usually on small islands or the tip of a peninsula.