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Was the bat identified as a Natterer's by the expert that was handling it (which may have been you?). If so, perhaps include this in the notes/comments as that's helpful where there are similar species, although I think the pinkish face distinguishes it from a whiskered bat?
OU Certificate in Contemporary Science
This bat was positively identified by myself and six other members of the Gloucestershire Bat Group during a recent bat box check. The bristles on the tail membrane and the S shaped calar are the main disiquishing features as you know, but they are not clearly visable in this picture. We processed approximately 25 Natterer's on the day, all found within old-style wooded boxes and they were the most abundant species found within this Small Lime wood.
Lat/Lng: 51.9, -2.4
OS grid ref: SO7527