There i am sitting at my desk in the office in Cambridge surfing in general(Google), when something outside caught my eye.
A Black squirrel, not grey, certainly not red, and the tail is long and fluffy so not a rat.
They are rare, but are gaining in numbers, and were introduced to this country at Woburn park near Bedford at the turn of the century, so I guess just over a hundred years is pretty new.
Look out for one, they're quite nice!

Black squirrels eh? There are LOADS of them on RAF Brampton near Huntingdon too...do you think they are ninja squirrels maybe?!? ;o)