123. Dryonastes cserulatus eaerulatus

(123) Dryonastes caerulatus caerulatus Hodgs.
THE SIKKIM GREY-SIDED LAUGHING-THRUSH.
Dryonastes caerulatus coerulatus, Fauna B. I., Birds, 2nd ed. vol. i, p. 141.
The breeding range of this Laughing Thrush extends from Nepal along the whole of the Himalayas as far as Dibrugarh in Assam but, so far, the only records of nests and eggs are from Sikkim and Nepal.
Gammie found it breeding in the Chinchona Reserves about Sikkim during May and June between 3,500 and 5,000 feet. The nests he describes as “placed in trees, at heights from six to twelve feet from the ground, between and firmly attached to several slender upright shoots. It is cup-shaped, usually rather shallow, composed of dry bamboo-leaves and twigs and lined with root- fibres. One I measured was 5 inches in diameter by 2.5 in height exteriorly ; the cavity was 4 inches across by 1.3 deep. Of course they vary slightly. As far as my experience goes they do not lay more than three eggs ; indeed at times only two.”
Another nest described by Hume “was in shape a slightly trun¬cated inverted cone, nearly 7 inches in height and 5.5 in diameter at the base of the cone, which was uppermost. The leaves attached to the twigs almost completely enveloped it. The nest itself was composed almost entirely of the stems of creepers, several of which were wound round the living leaves of the twigs so as to hold them in position on the outside of the nest. A few bamboo-leaves were intermingled with the creeper’s stems in the body of the nest. The cavity, which is almost perfectly hemispherical, only rather deeper, is 3.5 inches in diameter and 2.25 in depth, and is entirely and very neatly lined with fine black roots.
“A second nest found in a, bamboo-clump 10 feet from the ground was built of bamboo-leaves strengthened with a few creepers.”
Neats taken, later by Otto Muller in. the Darjiling Chinchona Plantations agree with the above and were placed, one at 5 feet and the other 10 feet from the ground.
Finally, Stevens obtained it breeding in Native Sikkim at 9,000 feet.
Eggs have been taken in May and June and, once, in July. They are a pale blue in colour but vary considerably in depth. While none are as pale as the eggs of the Dryonastes ruficollis group, some are nearly as dark as those of Garrulax moniliger. The surface is smooth and slightly to highly glossed, whilst the shape is a long but rather blunt oval.
Fifteen eggs average 30.5 x 22.1 mm. : maxima 32.5 x 22.6 and 32.0 x 22.8 mm. ; minima 28.5 x 22.2 and 30.0 x 21.7 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: 
123. Dryonastes cserulatus eaerulatus
Spp Author: 
Hodgs.
Book Author: 
Edward Charles Stuart Baker
CatNo: 
123
Year: 
1932
Page No: 
103
Common name: 
Sikkim Geey Sided Laughing Ush
M_ID: 
24891
M_SN: 
Garrulax caerulatus caerulatus
Volume: 
Vol. 1
id: 
13328

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