At the end of the lake at Kedleston is a weir that forms a splash pool before running off into the brook. In this pool were 2 half-grown Tufted ducklings that had possibly gone over the edge and now couldnt get back to the main lake (I think their mother was in the lake above with the rest of the brood) They both seemed healthy and were very active diving under and dabbling the surface for food. The falling water produced lots of froth which turned into fat bubbles among which the young birds splashed and dived.