2. Corvus corax tibetanus

(2) Corvus corax tibetanus Hodgson.
THE TIBET RAVEN.
Corvus corax tibetanus, Fauna B. I., Birds, 2nd ed. vol. i, p. 23.
This Raven breeds in large numbers throughout Tibet at elevations up to at least 13,000 feet and probably at even greater heights. It extends in lessening numbers into Sikkim, the Bhutan Hills and West into Ladak and Baltistan, though Mr. P. Ludlow says that it does not extend into Kashmir proper. This writer gives the following interesting account of its breeding in Tibet:—
“ ‘Ngakpas,’ Practisers of the Black Art in Tibet, one of whose duties is to keep hail off the crops in summer, make use of the Ravens’ eggs in the concoction of their medicines. These birds are very early breeders. Building commences about the end of January, and eggs may be taken in February and March. The site chosen for the nest is generally a ledge or hole in a precipitous cliff. Occasionally it will build in a large Poplar-tree, and sometimes in Tibetan houses or holes in ruined buildings, or in a deserted Kite’s nest ; but I can find nothing in my notes in support of the statement made in vol. i of the new edition of the ‘Fauna of British India’ that these birds breed in Willows and thorn-trees. The nest is the usual structure of sticks lined with wool and hair. In many cases the same site is used year after year. Eggs vary from three to six. The ground-colour is a greenish-blue which is spotted or deeply blotched with dark brown. The average of fourteen is 51.75 x 35.5 mm. A very large percentage of the birds round Gyantse failed to breed each year.”
The nests referred to above as being taken in willows and thorn- trees were obtained by Messrs. Steen, Kennedy and Macdonald and three clutches which eventually came into my hands were taken, two from what were described as “thorn-trees” and one from a Pollard-willow. All my other clutches were said to have been from nests on cliffs. Capt. Kennedy described the eggs as most difficult to obtain when built on cliffs owing to the deep snow, the difficult position in which they were generally built and the friable nature of the cliff itself.
In Sikkim Mandelli’s collectors obtained a clutch of four eggs of this Raven.
The Tibet Raven lays from the beginning of February to the end of March, though. I have two sets of eggs taken in April, both prob¬ably second layings of birds which had had their first nests destroyed or the eggs stolen.
The eggs differ as a series from those of the Punjab Raven in being duller in colour and rather broader in proportion to their length. Forty-two eggs, including Ludlow’s and Hume’s, average 51.61 x 35.2 mm. : maxima 58.4 x 40.3 mm. ; minima 45.9 x 33.2 and 48.0 x 32.1 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: 
2. Corvus corax tibetanus
Spp Author: 
Hodgson.
Book Author: 
Edward Charles Stuart Baker
CatNo: 
2
Year: 
1932
Page No: 
4
Common name: 
Tibet Raven
M_ID: 
20611
M_SN: 
Corvus corax tibetanus
Volume: 
Vol. 1
Term name: 
id: 
13225

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