THE BIBDS OF SINGAPORE ISLAND 
The **punai daun" or as it may popularly be called the 
thick-bilkd green pigeon (T rerun cun'irostris) is also not 
uncommon in Singapore, although not nearly so numerous as 
Treron zfernans. We have seen a female containing fully- 
developed eggs in February (in Singapore) and the presence of 
odd birds throughout the spring suggests that it may breed 
on the island. The male has a grey head^ green neck and 
green underparts. The back is reddish like that of the 
cinnamon-headed green pigeon. The female is green with 
the top of the head grey. Both sexes are immediately 
separated from all other local pigeons by their very thick bills, 
but this is a comparative character of little use in the field. 
Yet another fairly common and closely allied pigeon in 
Singapore is the small green pigeon (punai siul) technically 
known as Treron ala-^.. This is ranch smaller than any of the 
other green pigeons. In the male the head and tail are grey, 
the mantle maroon, the breast orange and the rest of the 
underparts green. The under tail-coverts are chestnut. The 
female is almost entirely green, but grey on the top of the head. 
Reference to the key printed above will reveal points whereby 
she can be separated from the females of the other species. 
We have on several occasions seen this pigeon in the more 
w^ooded parts of Singapore. The small flocks not infrequently 
get up off the ground, a habit we have not noticed in the punai. 
In the winter months we have met with it not tuicommonly 
near the Mandai Road and it is common on Pulau Ubin, 
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