The snowy heron is a rare plume bird seen occasionally along the coast.
Pulmonata are widely distinguished from a small number of Streptoneura at one time associated with them on account of their mantle-chamber being converted, as in Pulmonata, into a lung, and the ctenidium or branchial plume aborted.
Mantle-skirt, allowing the g, Gill-plume (ctenidium).
The young lack the ornamental plume, and in them the head and neck are clothed with short black feathers, while the bill is yellow.
The plumage is white, except the primaries, which are black, and a black plume, formed by the secondaries, tertials and lower scapulars, and richly glossed with bronze, blue and green, which curves gracefully over the hind-quarters.