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:"Megalornis" ''redirects here. This name was also (invalidly) given to the pseudotooth bird genus ''Dasornis'' by Harry Govier Seeley and proposed (but not adopted) for the moa genus ''Dinornis'' by Richard Owen.'' ''Ardea'' is a genus of herons. Linnaeus named this genus as the ''great herons'', referring to the generally large size of these birds, typically 80–100 cm or more in length. These large herons are associated with wetlands where they prey on fish, frogs, and other aquatic species. Most members of this almost worldwide group breed colonially in trees, building large stick nests. Northern species such as great blue, grey and purple herons may migrate south in winter, although the first two do so only from areas where the waters freeze. These are powerful birds with large spear-like bills, long necks and long legs, which hunt by waiting motionless or stalking their prey in shallow water before seizing it with a sudden lunge. They have a slow steady flight, with the neck retracted as is characteristic of herons and bitterns; this distinguishes them from storks, cranes, flamingos and spoonbills, which extend their necks. ==Taxonomy== Some members of ''Ardea'' are clearly very closely related, such as the grey, great blue, and cocoi herons, which form a superspecies. However, the great egret, in particular, has been placed in other genera by various authors as ''Egretta alba'' and ''Casmerodius alba''. Nevertheless, this species closely resembles the large ''Ardea'' herons in everything but color, whereas it shows fewer similarities to the smaller white egrets. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ardea (genus)」の詳細全文を読む スポンサード リンク
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