Walk round North drove and parish brook
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Everything you describe indicates serotine. Also you live well within their known range. Therefore, I have agreed to your observation. Bats are wonderful animals to watch and listen to!
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Thanks Graham - always difficult unless you know the person to judge how reliable their observations are - had their been a "absolutely Positive" button - I would have pushed it!
Avon Bat Group
Lat/Lng: 51.4267917713, -2.8079670667648
OS grid ref: ST439700