A colony of river terns. You can see in the last two pics that the juveniles are trying to fly. They did succeed at last. I have a pic where the adult fluttered his wings and showed the kids what to do. But, the boat was shaking and due to that the pic is of very bad quality.
Seen at Nalsarovar Bird Sanctuary.
This is a medium-sized tern, with dark grey upperparts, white underparts, a forked tail with long flexible streamers, and long pointed wings. The bill is yellow and the legs red. It has a black cap in breeding plumage. The sexes are similar but juveniles have a brown head, brown-marked grey upperparts, grey breast sides and white underparts. The bill is yellowish with a dark tip. The River Tern feeds by plunge-diving for fish, crustaceans, tadpoles and aquatic insects in rivers, lakes, and tanks. Its numbers are decreasing is due to the pollution of their habitat. My spotting from last year: http://www.projectnoah.org/spottings/116...