The sexes of the sacred ibis are alike and overall white in color. The neck and head have bare, black skin. The flight feathers are tipped with irredescent green ending in violet blue. The eyes are brown with an outer rim of crimson. The long, downward-curved bill, feet and toes are black. They are about 20 in. long with long slender legs. The nestling is white with head and back of neck black.