by William Swainson, Zoological Illustrations Series II… (1829)
“ Bill (fig. 1.2.) small, entire, base depressed and straight, the outer half of the culmen suddenly curved; lower mandible straight, nostrils large, oblong: Tarsi short, without scales; anterior toes of nearly equal length; (fig. 3.4.) claws strong; hinder toe long, not versatile, the claw very short and thick. ”
