A study of the facial features, head shapes and bill dimensions of Intermediate (Yellow-billed) Egret Egretta intermedia (top head, and small standing bird); Great Egret Ardea alba (second head); Little Egret Egretta garzetta (third head) and juvenile Grey Heron Ardea cinerea. To be honest, I can’t remember where exactly this was from. Birders might be interested to note that despite it superficial similarity to other white egrets, the Great Egret (previously Great White Egret) is now classified as an all-white heron in the genus Ardea, and not a giant egret in the genus Egretta.