a bird that lives near water and has long legs and long white tail feathers.——朗文当代大辞典

Any of various small or medium-sized herons, chiefly of the genus Egretta, typically with white or buff plumage and fine filamentous plumes down the back in the breeding season; esp. (in earlier use) the little egret, E. garzetta, of the Old World.——牛津当代大辞典  @en