Lightening.

While we see evidence of visits by a squirrel everyday we don't actually see them all that often.  They were fairly unusual visitors until "In to the Hills" (of this parish) suggested a feeder, now they are regular visitors. 

This one I call lightening because it is so timid and is rarely still.  It is recognisable by the dark tail and lack of ear tufts.   Red Squirrels usually have ear tufts one of the things which distinguishes them from the Greys.