island for hoolock gibbons (Hoolock hoolock)

Showing only about a third of the island. For scale, there are two hoolocks sitting on the little bridge on the far right of the photo (or maybe one hoolock -- there were two sitting very close together but maybe one had left when this photo was taken). Later they were up in the trees.

For everything else at the zoo, see my review here: http://www.zoochat.com/254/visit-assam-state-zoo-guwahati-10-a-358287/