Gang-gangs gathered to feed and chat, in preparation to roost. I could hear them, but could not make any estimation of the numbers hidden in the foliage. They then began to get vocal, with many making the 'let's fly' call, so I readied myself at a vantage point in case they all rose. And they did - a cloud of 22 gang-gangs, in all their smooth flying glory. I could not have predicted there were this many amongst the copse of trees. At least one pair remained, too busy feeding, softly talking. I suspect there was another pair hidden, but not verified.