Shri Sabyasachi,
Dabchick or Little Grebe (Podiceps ruficollis)
Bengali:Pandubi, Hindi:Laokri,Dubdubi
(a)The dabchick's nest is a pad of sodden weedstems placed on partly submerged floating plants.The eggs-3 to 5-are white when laid but soon become dirty and discoloured through contact with the sodden grasses with which the bird covers them up each time it leaves the nest on disturbance or for feeding.The diminutive downy chicks are striped,and often carried about riding on parent's back.
(b)They build their nests during the months between April to October in the jheels or wetlands in and around Kolkata and in other parts of West Bengal.

Kind regards,
SaktiWild

My indebtedness to Noted Naturalists:
(a)Salim Ali
(b)Pranabesh Sanyal and Biswajit Roychowdhury