I'd not seen this behaviour before and don't know what it signifies. Possibly something to do with the fact that it had just started raining? Or that this group of females were just approaching the nilgai housing?
On a related note: I see from the Jan 2017 inventory that the blackbuck are listed as 0.5, down from the previous year's 1.5.
@ro6ca66 It looks like they are scenting something.
I guess the old single male in the Asian Plains has died then. I feared that might happen given the time frame. But they should be able to get another without too much problem.