1838. Treron curvirostra nipalensis

(1838)Treron curvirostra nipalensis Hodgs.
THE NORTHERN THICK-BILLED GREEN PIGEON.
Treron curvirostra nipalensis, Fauna B, I., Birds, 2nd ed. vol. v, p. 196.
This little Green Pigeon, so easily distinguished by its scarlet gape and cere, is an inhabitant of the lower hills and adjacent plains of Western Nepal to Eastern Assam and Eastern Bengal ; practically the whole of Burma as far South as Tenasserim, East to the Shan States, Yunnan, Annam, Siam and Cochin China.
The farthest West of which I have any breeding notes are in reference to several clutches of eggs taken by Whymper in the Nepal Terai in May 1908. He then found them breeding freely, making their nests “in low trees or in bamboo-clumps.”
In Assam we found that the birds kept very closely to forest for breeding purposes, though it did not matter whether this was evergreen, deciduous, secondary growth or even the scrub growing round villages, while on more than one occasion I found them breeding in the orange-groves round my house.
The nest cannot be distinguished from that of the Orange-breasted Green Pigeon, being equally flimsy and placed in quite the same sort of position. Unlike that bird, however, it sometimes breeds in company, and I have several times seen two or three nests within a few yards of one another.
The breeding season is principally late April to early June throughout its Indian and Northern Burmese range, but many eggs may be taken as early as March and others as late as August, while I have also taken them in September and October, these latter being probably second or third broods. In Southern Burma they breed earlier, Bingham, Hopwood and Mackenzie recording eggs taken from the end of January to the end of March.
It is rather interesting to note that Assam eggs seem very small, 100 averaging 27.9 x 20.8 mm., whereas 200 taken from all parts of the Indian Empire average 28.7 x 22.0 mm. : maxima 30.0 x 22.0 and 28.3 x 23.2 mm. ; minima 25.9 x 20.8 and 26.0 x 20.0 mm.
Both sexes incubate and both take a share in building operations. These latter I have been able to watch very closely, as a pair built in an Orange-tree in my garden and quite close to my front verandah. When the birds arrived in the grove they wandered from one tree to another and took a long time to decide which Orange-tree in the grove suited them best. All the trees were much alike, about 8 to 10 feet high and, of course, very dense and bushy, and it was only after two or three other trees had been tried and a twig or two placed in position that they made their final choice. Every morning and evening they worked for an hour or two, one bird often undoing the work done by the other, yet in four days the apology for a nest was finished and on the morning of the fifth day an egg was laid. Fourteen days after that there were two chicks in the nest, but they may have been hatched the day before, giving a period of incubation of thirteen days. The birds did not mind my moving about in the grove, though from more than one point the sitting bird was quite visible. They sat very close, the male doing most of the work, but between noon and about four o’clock they left the eggs uncovered and wandered about feeding, one bird being always somewhere near the nest.

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: 
1838. Treron curvirostra nipalensis
Spp Author: 
Hodgs.
Book Author: 
Edward Charles Stuart Baker
CatNo: 
1838
Year: 
1935
Page No: 
134
Common name: 
Thick Billed Green Pigeon
M_ID: 
5458
M_SN: 
Treron curvirostra nipalensis
Volume: 
Vol. 4
Term name: 
id: 
15010

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