HARPY-EAGLES. 
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bars horizontal. This stage, which is the one represented in our illustration, is, 
however, according to Yon Penzeln, the plumage of the immature bird. The adult 
is much darker, having the head and throat greyish brown, most of the upper-parts 
dark blackish brown shaded and mottled with ashy, the upper tail-coverts with 
white tips and irregular white barrings, the chest dark coloured, and the remainder 
of the under-parts white. The dark tail, according to Dr. Sharpe, is tipped with 
whitish brown and crossed with only three pale bars, above which it has some 
whitish markings. But little is known of the mode of life of this handsome bird, 
which occurs both in the forest near the coasts, and the wooded districts of the 
plains, but more commonly on the banks of the rivers. During its periods of 
repose this eagle will sit for hours on the summit of some dead tree, uttering at 
intervals its peculiarly loud and harsh cry. Its prey comprises mammals and 
birds, and its nest is said to be generally built in a hollow tree. More is known 
concerning the true harpy-eagle, which is the most powerful bird of prey in North 
