Genus— U R 0 A E T U S . 
Ueoaetus Kaup, Classif. Saugeth. Vogel, p. 121, 1844 . . Type U, audax. 
Also spelt — 
Ura'etus Kaup, Mus. Senckenb., Vol. III., p. 260, 1845. 
Largest Aquiline birds, with comparatively small bill, long wings, long 
wedge-shaped tail, and short feathered legs and strong feet. 
The bill is moderately curved, the hook long and perpendicularly 
descending, the lower edge of the upper mandibles scarcely sinuate ; cere 
comparatively small : nostrils rather perpendicularly oval with an internal 
bony obstruction. 
The wing is very long, the primaries strongly emarginate ; the fourth 
is longest, the third and fifth subequal and little less, the first shorter than 
the seventh. 
The tail is long, about two-thirds the length of the wing, and 
wedge-shaped. 
The legs are feathered down on to the toes ; the tarsus is about 
one-fourth the length of the tail ; the toes are strong and of medium 
length. 
This genus differs principally from Aquila in the longer wedge-shaped 
tail, but differs from all other Australian birds in its superior size. 
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