The necks are able to kink in an s-shape, due to the modified shape of the sixth vertebrae. The neck is able to retract and extend, and is retracted during flight, unlike most other long-necked birds. To differentiate itself from the Herons, all Egrets are white in color except one species, the Pacific Reef Egret has two color morphs, the light and the dark. The percentage of each morph varies geographically. White morphs only occur in areas with coral beaches.