Sorry, I meant to say your nuts! I am thinking Wood Mouse, but could any be Bank Vole?
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My guess would be a young squirrel but couldn't say whether red or grey. It is the random furrows (seen particularly on the bottom of the 3 nuts) that leads me to this - indicative of a youngster which will gnaw at random until, by chance, a hole appears. Having said that, the nut on the right of the pic looks very like that made by a bank vole! Sorry; that's the best I can do.
The inner edge of the nut being chiselled is normally wood mouse or bank vole, and if there are also gnaw marks on the outside of the nuts that indicates wood mouse, however I didn't know young squirrels fed differently to adult ones - the adults usually just make a clean split along the nut but I suppose youngsters might not be strong enough to do that (or have mastered the technique). So inconclusive I'm afraid(!), but if anything I would have said wood mouse.
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The outer markings are unusual, especially on the bottom nut but personally I would also suggest wood mouse for all 3.
You may very well be right about mouse/vole; they certainly look more like one or the other. It was the random gnawing marks (seen most clearly in the bottom nut) that made me think about young squirrels which do indeed learn how to open nuts only through experience. As I said earlier, they gnaw furrows at random on the shell until a hole appears. They can then insert their lower incisors to break off a piece of shell. Only after this do they learn the best place to gnaw a groove across the top which can then be 'crow-barred' open with the lower incisors.
Interesting - thanks for that:-)
The random 'attack' on nuts goes for any species, they've got to learn; opening nut is not an inherent trait, or at least the technique isn't.
That said I would say the outer marks were too small for the teeth of even a juvenile squirrel, and as they all have them I would plump for wood mouse.
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