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....ID based on geography - it could also be yellow-necked - and therefore Apodemus would be more accurate. As far as I am aware - yellow-necked isn't in Ireland yet!! :)
... but you never know. This one didn't pose for a second photo!
Yellow-necked mouse has yet to be identified in Ireland so safe bet it is a wood mouse. I've added an id for wood mouse as, strictly speaking, there is no such animal as a field mouse; it is a term used to describe most small European mice and, in America, small voles.
I know iSpot offers common field mouse first but that is a quirk of the NBN database used to name species.
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... the temptation is to take whichever one seems most appropriate. If it was in grassland its a field mouse or if near trees, a wood mouse.
Lat/Lng: 54.641, -5.957
OS grid ref: NW447345