On the way back from the Limestone Coast I noticed a flock of Pelicans circling above a lake in the Coorong National Park. When I stopped and looked properly, there were waves of Pelicans circling, gaining height, and then peeling off, all heading north. I estimate that there were at least 600, in groups of 75-100. I don't know where they were going, but they all seemed to know! It was a wonderful sight.