161. Trochalopteron affine affine

(161) Trochalopteron affine affine (Blyth).
Trochalopterum, affine affine, Fauna B. I., Birds, 2nd ed. vol. i, p. 172.
This is the most alpine or truly palaearetic form of all the Laughing- Thrushes, occurring in the Himalayas from Nepal to Sikkim and Bhutan at great altitudes, ascending in Summer up to 13,000 and even in Winter up to 10,000 feet.
Osmaston took the nests of this bird in 1902, and thus records his success (Journ. Bomb. Nat. Hist. Soc. vol. xiv, p. 815, 1903):— “ This species is fairly common at elevations from 9,000 to 13,000 feet in the Rhododendron and Fir forests of the Singalila Ridge. I found three nests of this bird on the 31st May, 1902, in Rhododendron and Viburnum bushes, 5 to 8 feet from the ground, at an elevation of about 11,500 feet. The nests were rather massive but neat cups, about 8 inches in external diameter, and were composed of moss, thin twigs and dry grass stems, lined copiously with the black rhizomorph of a fungus (resembling thin black roots) mixed with some birch-bark ‘paper.’ Two of the nests each contained two slightly set eggs and the third two freshly hatched young.”
In 1909 and 1911 Masson worked the higher parts of this same Singalila Ridge, 9,000 to 12,000 feet, and sent me a nice little series of nests and eggs with the skins of the parent birds.
A nest secured in 1909 was said to have been taken in high bushes ; whilst those taken in 1911 were in Rhododendron-trees about 6 feet up or in bushes 4 to 5 up. The nests are, as described by Osmaston, deep well-built cups about inches across by about 4 deep. They were made outwardly principally of moss, both dry and green, with the inner part of grass, roots, twigs and leaves and then lined with the same black rhizomorph mentioned by Osmaston. All the nests sent to me were taken in May, and of these one contained three eggs, the others each two only.
The ground-colour varies from moderately pale to quite a deep blue, with a greenish tinge. They are all marked with a few brownish or reddish-black spots and blotches and one or two short twisted lines. These are nearly all confined to the larger end, except in one clutch, and are sparse or absent elsewhere. In one clutch nearly all the markings consist of dark red-brown seriggles and lines at the extreme larger end.
Twelve eggs average 28.5 x 21.2 mm. : maxima 31.2 x 21.5 and 28.8 x 22.1 mm. ; minima 27.6 x 21.4 and 28.1 x 19.9 mm.

The Nidification Of Birds Of The Indian Empire
Baker, Edward Charles Stuart. The nidification of birds of the Indian Empire. Vol. 1. 1932.
Title in Book: 
161. Trochalopteron affine affine
Spp Author: 
Book Author: 
Edward Charles Stuart Baker
Page No: 
Common name: 
Nepal Black-faced Laughing-thrush
Trochalopteron affine affine
Vol. 1

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