1810. Astur trivirgatus indicus

(1810) Astur trivirgatus indicus Pearson.
THE NORTHERN CRESTED GOSHAWK.
Astur trivirgatus rufitinctus, Fauna B. I., Birds, 2nd ed. vol. v, p. 156.
Astur trivirgatus indicus, ibid, vol. viii, p, 687.
The Northern form of Created Goshawk extends over the whole of India North of the range of the previous race, but it is not found West of Garhwal, In Burma it occurs as far South as Northern Tenasserim and peninsular Siam, and extends East through the Indo-Chinese countries to Formosa and Hainan.
Like the preceding bird, this is a frequenter of forests and keeps even more exclusively to them. There is not much one can add to what has already been written about the typical form, but a description of two nests taken by myself embraces most of what there is to say. In North Cachar we found it breeding from the foot-hills up to 5,000 feet, but more commonly at about 3,000 feet. One of the first nests I ever took was built on a big densely foliaged tree at about 40 feet from the ground. The nest, nearly 20 inches in diameter by over 12 inches deep, which had obviously been occupied for several years, was built of sticks, mostly small but some, though only a foot or so in length, were about 2 inches in diameter. The egg-cavity was fairly deep and was well lined with leaves, withered when we found the nest but, presumably, fresh and green when first put in. The parent birds kept swooping at the Naga boy as he climbed the tree and several times swooped to within a foot or two of his head so, finally, I had to fire twice to drive them off. The nest was on a large tree standing in dense evergreen forest on the banks of the Laisung stream, the kind of situation we generally found the nests in.
In the Khasia Hills the bird was more scarce than in Cachar, not caring for the sombre Pine-forests, though it occasionally bred in them. I found one of their nests with young ones in 1908 and again in 1909, hut succeeded in taking egga in 1910, the birds laying and bringing up a second brood in the same nest. In 1911 and 1912 I was away during the breeding season. In 1916 one of my men again took eggs, but reported it empty the following year. In 1921, however, when passing the tree he found it occupied and took three eggs.
This nest was in a Pine-tree (Pinus khasianus) at about 40 feet from the ground, or rather above the little stream which it overhung. It was just like the other nest already described except that I twice found it well lined with green leaves which it must have provided after the eggs had been laid.
We found it really dangerous for the boys to climb trees for the nests of this Hawk and had almost invariably to fire shots into the air to scare the old birds, though once or twice these flapped away without making any demonstration.
The breeding season is March, April and May, and either two or three eggs are laid which are not distinguishable from those of the preceding bird though they average a good deal higger.
Twenty eggs average 48.4 x 39.6 mm. : maxima 50.4 x 38.0 and 49.8 x 41.0 mm. ; minima 45.0 x 39.7 and 50.4 x 38.0 mm.
I have only seen one nest being repaired and in this case both birds were noticed bringing sticks to it. I cannot say if the male takes any part in incubation, but believe it does, as I have seen and shot one male as it left the tree in which the nest was concealed, there being then no signs of the female.

BookTitle: 
The Nidification Of Birds Of The Indian Empire
Reference: 
Baker, Edward Charles Stuart. The nidification of birds of the Indian Empire. Vol. 4. 1935.
Title in Book: 
1810. Astur trivirgatus indicus
Spp Author: 
Pearson.
Book Author: 
Edward Charles Stuart Baker
CatNo: 
1810
Year: 
1935
Page No: 
109
Common name: 
Norrn Crested Goshawk
M_ID: 
2838
M_SN: 
Accipiter trivirgatus indicus
Volume: 
Vol. 4
id: 
14982

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