This large bird of prey, renowned for its keen sight and powerful soaring flight, is traditionally regarded as the king of birds. In the 15th-century Boke of St Albans, the eagle is listed in falconry as the bird for an emperor.
An eagle is the emblem of St John the Evangelist.
The figure of an eagle was used as an ensign in the Roman and French imperial armies; a figure of a bald eagle is the emblem of the United States, from which the Eagle may mean the US.
eagles don't catch flies great or important persons do not concern themselves with trifling matters. The saying is recorded from the mid 16th century, but the Latin aquila non captat muscas ‘the eagle does not catch flies’ is found in the Adages of the Dutch Christian humanist Erasmus (c. 1469–1536).
keep an eagle eye on keep a keen and close watch on.
two-headed eagle the emblem of the empires of Austria and Russia.