In some birds, such as the herons, certain down-feathers or plumulae break off into a fine dust as fast as they are formed and form tracts defined in size and situation and known as "powder-down patches."
(From the original in the Museum of Zoology of the University of Cambridge.) parrot, of ducks, pigeons, rails, herons, geese and of a dwarf darter, Plotus nanus, all sub-fossil, now extinct.
More or less cosmopolitan groups like herons, Falconidae, Anseres, Columbae, &c., and circumtropical families like Parridae, Trogonidae,.
23), and the severing of the latter from the herons (No.
The herons, for instance, are much more Constrictipedes " than are the larks or the kingfishers, and, so far from the majority of " Inconstrictipedes " being polygamous, there is scarcely any evidence of polygamy obtaining as a habit among birds in a state of nature except in certain of the Gallinae and a very few others.
How would you define herons? Add your definition here.