Hibernation Survey
During the winter, licensed bat workers monitor hibernation sites around the UK and many of them kindly share their findings with the National Bat Monitoring Programme so that we can include the data in the species population trends we produce. So far for winter 2022/23 we have received bat counts from at least 98 volunteers at 436 sites/compartments of sites. The species distributions can be seen by clicking on the links at the bottom of this page.
Barbastelle
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_Barb_2024-02-12-145629_cnbk.png?v=1707749817)
Based on the data received from NBMP volunteers so far, barbastelles were found in 11 sites, 2.5% of sites monitored.
View enlarged map here.
Bechstein's bat
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_Bechstein_2024-02-12-151420_lixh.png?v=1707750886)
Based on the data received from NBMP volunteers so far, Bechstein's bat was found in four sites, <1% of sites monitored.
View enlarged map here.
Brown long-eared bat
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_BLE_2024-02-12-152251_ayso.png?v=1707751397)
Based on the data received from NBMP volunteers so far, brown long-eared bats were found in 130 sites, 29.8% of sites monitored.
View enlarged map here.
Common pipistrelle
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_Common-pip-45_2024-02-12-152833_jlpu.png?v=1707751740)
Based on the data received from NBMP volunteers so far, common pipistrelles were found in 15 sites, 3.4% of sites monitored.
View enlarged map here.
Daubenton's bat
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_Daub_2024-02-12-153726_ghkz.png?v=1707752272)
Based on the data received from NBMP volunteers so far, Daubenton's bats were found in 159 sites, 36.5% of sites monitored.
View enlarged map here.
Greater horseshoe bat
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_GHB_2024-02-12-155256_simd.png?v=1707753203)
Based on the data received from NBMP volunteers so far, greater horseshoe bats were found in 83 sites, 19% of sites monitored.
View enlarged map here.
Greater mouse-eared bat
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_GME_2024-02-12-155710_tyel.png?v=1707753459)
Based on the data received from NBMP volunteers so far, two greater mouse-eared bats were found at two sites.
View enlarged map here.
Lesser horseshoe bat
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_LHB_2024-02-12-161010_monj.png?v=1707754237)
Based on the data received from NBMP volunteers so far, lesser horseshoe bats were found in 129 sites, 29.6% of sites monitored.
View enlarged map here.
Natterer's bat
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_Natterers_2024-02-12-161346_dvto.png?v=1707754453)
Based on the data received from NBMP volunteers so far, Natterer's bats were found in 179 sites, 41.1% of sites monitored.
View enlarged map here.
Serotine
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_Serotine_2024-02-12-161800_illu.png?v=1707754708)
Based on the data received from NBMP volunteers so far, serotines were found in two sites, <1% of sites monitored.
View enlarged map here.
Soprano pipistrelle
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_Soprano-pip-55_2024-02-12-162247_tupd.png?v=1707754994)
Based on the data received from NBMP volunteers so far, soprano pipistrelles were found in four sites, <1% of sites monitored.
View enlarged map here.
Whiskered/Brandt's/Alcathoe bat
![Hibernation Survey](https://cdn.bats.org.uk/uploads/images/Hib-Survey_WhiskeredBrandtsAlcathoe-bat_2024-02-12-162534_mhnk.png?v=1707755160)
Based on the data received from NBMP volunteers so far, whiskered/Brandt's/Alcathoe bats were found in 61 sites, 14% of sites monitored. Whiskered bats identified to species level were present in a further five (<2%) of sites.
View enlarged map here.