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How can you be sure it is not A. flavicollis (yellow-necked mouse)?
It is hard to be 100 percent, I simply felt Apodemus sylvaticus seemed to fit the G.I.S.S. The feeder its sat on only measures approx. 65mm. Please feel free to add any further info.
(65mm diameter at base.)
I would have said it is impossible to get past the genus. Size in this context is irrelevant. Revise it to the genus, and you can be sure of the ID.
A valid point, which I will bare in mind for future. At the time of making this i.d. I was unaware of the remarkable similarities between the 2.
Agree that more accurate to only go to genus is this location.
OU Certificate in Contemporary Science
Lat/Lng: 50.4, -4.5
OS grid ref: SX2862