This lake is connected to the cooling water of the main ring moat and hence it stays open longer in the winter than any of the other large lakes on site. Consequently it is probably the best location on site for overwintering waterfowl. In the early spring Common Mergansers and Common Goldeneyes accumulate on the lake just before dusk and can often be seen performing their courtship displays. It is also a very good spot for geese and all the species that have been recorded on site can be found here most years. Not surprisingly, this lake has produced an impressive list of rarities: Mute Swan, Black Scoter (1997), Long-tailed Duck (2004), Red-necked Grebe (1994), Bald Eagle, Iceland Gull (2001), and Glaucous Gull (2002).