My wife picked this pellet up as it looked large for an owl pellet.
The fur hair in the pellet was 2cm+ long
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Picture isn't entirely sharp, but from the scale and details posted I think squirrel is a reasonable assesment. There is a sketch of half a squirrel pelvis on page 244 of
'Mammals of Britain Their Tracks Trails and Signs' by Lawrence and Brown (2nd ed 1973) which doesn't entirely resemble the pelvic bones at top centre of the photo, but the shafts of these are broken and other bits may have been chewed off.
I can see your concerns matching it to the picture and I think you are right to do so. I think these are rat remains, the pelvis looks more like rat than squirrel and the measurements would be right for a small rat - however, for a young squirrel as well.
Shame there is no skull.
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