So, serious question, how do you know they hibernate in the Windsor
area?

The complete lack of sightings during the winter.

Alan

If they hibernate in the UK they must be of a different breed than
ours.(USA)......we have both the red and the greys playing in our garden
area every single day.......great fun to watch........(especially now when
the breeding time is upon us)........even in the minus 17 C degree weather
they continue.
HW.