The Main Ring Moat is a series of connected ponds that forms a circle just
inside the Tevatron accelerator ring. The ponds are used as a source of cooling
water for the accelerator components which means that they often remain open
even when most of the lake on site are frozen and that means that the moat is a
good place to look for wintering waterfowl. Main Ring road runs in a circle
between the moat and the accelerator ring and hence allows one to get close up
looks at both wintering and migrating waterfowl. It also provides good views of
the prairie inside the ring where, in winter, one can often find
Northern Shrikes and
Rough-legged Hawks as well as
Snow Buntings along the road itself.
In 1999 a male Ring-necked Duck
spent an entire summer on the north-western part of the moat and more recently a
has spent the entire winter on the south-eastern part.