466 BRITISH BIRDS. 
Family PELARGID, or HERONS. 
The Herons and their allies form a small and isolated family, which 
Sclater elevates to the rank of an order under the name of Herodiones 
(the Pelargomorphe of Huxley). Forbes agreed with this classification, 
except that he removed the Ibises and the Spoonbills, which he placed 
in juxtaposition with the Curlews and the Cranes. In the Herons, Storks, 
and at least one of the Spoonbills, there is only one deep cleft on each 
side of the posterior margin of the sternum; but in the majority of the 
Spoonbills, and in the Ibises, there are two notches on each side. The 
modification of the cranial bones in this family, like that of the Birds of 
Prey and the Owls, is somewhat variable, the typical desmognathism being 
occasionally incomplete. In their myology, and in the character of their 
digestive organs, they agree fairly well together ; but in their pterylosis the 
Herons are somewhat peculiar, the presence of what are called ‘‘ powder- 
down patches” isolating them from all other birds, except some species of 
Birds of Prey, Parrots, and one or two other genera. 
It has generally been supposed that most of the birds belonging to this 
family have only one complete moult during the year, which takes place 
in autumn. All ornithologists admit that the Ibises moult their small 
feathers a second time in spring; and there can be little doubt that the 
special nuptial feathers, such as the elongated scapulars of the Egrets and 
the crests of the Spoonbills, appear in spring and are lost in the autumn 
moult. In the birds of all these genera the quill-feathers are moulted 
very slowly, and apparently im pairs, only as they are required, and 
probably at any season of the year except when the birds are engaged in 
breeding, in this respect resembling the Swifts and the Birds of Prey. 
Their principal external characters are their long legs, and long and 
powerful bill, The young birds are covered with down, and are able to see 
as soon as they are hatched, but are comparatively helpless, and are fed by 
their parents fcr a considerable time before they are able to leave the nest. 
The wings are usually long and broad and contain ten primaries, and the 
tail is short and nearly even. 
This family includes about a hundred and twenty species, and is almost 
cosmopolitan, except that it is not represented in the Arctic Regions. 
Thirteen species are European, three of which breed in the British Islands, 
and the rest are accidental stragglers to them, as is also one American 
species. 
