Categories DavidOn patrol: great crested grebes, Pool Hall Post author By David Post date 3 April 2016 Two of the three great crested grebes on Pool Hall fisheries lake towards the end of March. Each bird had a different stretch of the water as its territory, and was swimming up and down on patrol to make sure the others kept out. ← 2016: first bluebells → Beginning to emerge, pussy willow catkins