Serotine

Eptesicus serotinus

The serotine bat, also known as the common serotine bat, eurasian serotine, big brown bat, or silky bat, is a considerably large Eurasian bat with large ears. It has a wingspan of around 37 cm (15 in) and often hunts in woodland. It sometimes roosts in buildings, hanging upside down, in small groups or individually. The name serotine is derived from the Latin serotinus, which means 'evening', while the former generic name derives from Greek ἔπιεν and οίκος, which means 'house flyer'. Source

Where it is now

In the last 8 weeks this bat was recorded 674 times across 6 areas (each area is a 5 degree square).

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Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

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Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.