From the top Right working counter clockwise: Great Egret (Ardea alba), Intermediate Egret (Ardea ), Little Egret (Egretta garzetta), White Ibis () and Cattle Egret (Egretta ibis)
Stylised down to one colour (breeding plumage on cattle egrets is golden and the larger egrets faces flush various colours)
Ink and red pen with a gradient tone added in Photoshop.
The five species roost at the Hunter Wetlands in Newcastle Australia.
Anyway, I love this one a lot - it seems like a Japanese woodblock print. Beautiful!