9. Corvas frugilegus tsehusii

(9) Corvus frugilegus tsehusii Hartert.
THE EASTERN ROOK.
Corvus frugilegus tsehusii, Fauna B. I., Birds, 2nd ed. vol. i, p. 30.
The Eastern Rook breeds in Persia, Turkestan and Siberia. Ludlow found colonies breeding near the Aksu road in North-East Turkestan and a native collector of Col. A. E. Ward took a single clutch of the eggs in Ladak, where, however, Meinertzhagen did not meet with it. This last-mentioned clutch, was taken by Jammat Oolah for Col. Ward and two birds were shot from the small colony and sent to him for identification ; they were then forwarded to me to view and return and are now, I believe, in Col. Ward’s own collection. The eggs are no doubt quite correctly identified. They were taken on the 27th April from a small colony of about fifteen pairs which were nesting on a number of quite small trees growing at an elevation of abont 10,000 feet.
Two rookeries found by Mr. F. Ludlow in Turkestan, one on the right bank of the Agiass River at its junction with the Tekkes River, on the 14th May, and the other on the Shotta-Ili road, three miles from Gillam, contained 500 and 1,500 nests respectively. In the first the nests were all built on small trees and bushes, whilst in the second they were built in low buck-thorn and Willow bushes. The Agiass colony was on the bank of the river but the second colony was in a small island formed by two branches of the Tekkes River. Most of the nests contained three eggs only but two of those on the larger rookery each contained four.
The eggs are indistinguishable from those of the European Rook. The ground-colour in all is a light green, brighter in some, slightly olive in others and more brownish in one clutch of three. The markings consist of fairly large blotches of dark umber and blackish-brown, numerous everywhere but less so at the smaller end. In one or two clutches the markings are more sparse and the ground¬colour therefore shows up more boldly. In one clutch only the marks form caps, distinct in one egg, ill-defined in the other two. The secondary blotches of grey or neutral tint are few and incon¬spicuous.
Fifty eggs average 40.9 x 28.2 mm. : maxima 45.0 x 29.0 mm. and 42.2 x 30.1 mm. ; minima 34.0 x 26.2 and 34.1 x 25.2 mm. The minima are almost abnormal and the next smallest eggs are 38.1 x 29.5 and 38.7 x 27.0 mm.

BookTitle: 
The Nidification Of Birds Of The Indian Empire
Reference: 
Baker, Edward Charles Stuart. The nidification of birds of the Indian Empire. Vol. 1. 1932.
Title in Book: 
9. Corvas frugilegus tsehusii
Spp Author: 
Harter.
Book Author: 
Edward Charles Stuart Baker
CatNo: 
9
Year: 
1932
Page No: 
14
Common name: 
Eastern Rook
M_ID: 
20546
M_CN: 
Rook
M_SN: 
Corvus frugilegus
Volume: 
Vol. 1
Term name: 
id: 
13234

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