2o4 JOURNAL, BOMBAY NATURAL HIST. SOCIETY, Vol. XXI. 



Both birds share in carrying materials, tind in building operations. I 

 have, however, on one or two occasions noticed that the cock brought the 

 materials, and the hen alone was the architect. Once a site has been 

 chosen, building operations progress with great rapidity, but I have not 

 yet been able to ascertain the exact length of time taken by the birds in, 

 constructing a nest. When the latter has been completed, a very short 

 period seems to elapse before the first egg is laid. 



These Sibias have a peculiar habit of deserting their nests on the least 

 provocation — merely climbmc/ the tree and only peeping into the nest in 

 some cases, is enough — and it is, therefore, most difficult to make any obser- 

 vations. I have been unable to ascertain the time which elapses between the 

 laying of the eggs, but the hen begins to brood after the first egg has been 

 laid. She is very "'ary, and genearlly leaves the nest long before a person 

 gets to the tree. So far as my experiences go, I do not think that the 

 cock takes any part in the hatching of the eggs. 



The number of eggs varied from 2 to 3. In one nest I found a solitary 

 chick wriggling out of its shell, and the largest number of young found 

 in a ilest were two. 



