Nisaetus fasciatus, Vieill.
33. :- Nisaetus bonelli, Tem. :- Jerdon's Birds of India, Vol. I, p. 67; Butler, Deccan, &c.; Stray Feathers, Vol. IX, p. 373 ; Guzerat, Stray Feathers, Vol. III, p. 446 ; Murray's Vertebrate Zoology of Sind, p. 77 ; Hume's Scrap Book, p. 189.
THE CRESTLESS HAWK EAGLE.
Length, 27 to 29 ; expanse, 64 to 68; wing, 18.5 to 20 ; tail, 11 to 13; tarsus, 3.75 to 4 ;bill from gape, 2.1 2.2.
Bill greenish-horny, black at tip; irides bright yellow, pale brown in the young bird ; feet pale greenish-yellow.
Adult: above dark hair-brown, with usually some white about the head and back of neck; quills dusky-black; tail slaty-greyish, with about seven narrow dark bars, and a broad subterminal one ; beneath white, with dark brown mesial streaks on the feathers of the lower part of the abdomen; thigh-coverts, tarsal feathers and vent nearly brown, the feathers centred darker, and the thigh-coverts, tarsal feathers, and under tail-coverts more or less banded with white, or with rufous in some In some old birds the entire ground color of the lower parts is rufous-brown.
The young bird is pale brown above, pale rufous or ferruginous beneath, in some nearly white; tail pale greyish-brown, with dark bars.
With each successive moult the white or ferruginous becomes purer white and the dark central stripe to each feather increases in size, more especially on the lower part of the abdomen.
The Orestless Hawk, or as some prefer to call it, Bonelli's Eagle, occurs throughout the region, but is nowhere common. It nests on ledges of rocky cliffs, which are often very difficult of access, owing to their choosing a site under a projecting crag. The nest is a huge affair composed of sticks, sometimes measuring four or five feet in diameter; the egg cavity is lined with green leaves; the eggs, two in number, are moderately broad ovals, measuring 2.75 by 2 ; they are of a pale greyish-white color, sometimes unspotted, but are generally thinly marked with yellowish or reddish-brown spots. They are seldom, if ever, richly marked.