Nick Upton / Lesser horseshoe bat (Rhinolophus hipposideros) held during an autumn swarming survey run by the Wiltshire Bat Group, near Box, Wiltshire, UK, September. Model released.

Nick Upton / Two hibernating Lesser horseshoe bat (Rhinolophus hipposideros) hanging from the roof of an old Bath stone mine, Wiltshire, UK, February. Photographed during a licensed survey.

Nick Upton / Hibernating Lesser horseshoe bat (Rhinolophus hipposideros) hanging on limestone rock in an old Bath stone mine, Wiltshire, UK, February. Photographed during a licensed survey.

Nick Upton / Hibernating Lesser horseshoe bat (Rhinolophus hipposideros) hanging on limestone rock in an old Bath stone mine, Bath and Northeast Somerset, UK, January. Photographed during a licensed survey.

Nick Upton / Hibernating Lesser horseshoe bat (Rhinolophus hipposideros) hanging on limestone rock in an old Bath stone mine, Wiltshire, UK, February. Photographed during a licensed survey.

Nick Upton / Hibernating Lesser horseshoe bat (Rhinolophus hipposideros) hanging on limestone rock in an old Bath stone mine, Wiltshire, UK, February. Photographed during a licensed survey.

Nick Upton / Hibernating Lesser horseshoe bat (Rhinolophus hipposideros) hanging on limestone rock in an old Bath stone mine next to plant roots growing down from woodland above, Wiltshire, UK, February. Photograp...

Nick Upton / Bat scientist Dr. Fiona Mathews taking temperature and humidity records in an old Bath stone mine during a winter hibernation survey for Greater horseshoe bats (Rhinolophus ferrumequinum) with a Lesse...

Nick Upton / Dr. Danielle Linton weighing a Greater horseshoe bat (Rhinolophus ferrumequinum) during a winter hibernation survey in an old Bath stone mine, with a Lesser horseshoe bat (Rhinolophus hipposideros) ha...

Roland Seitre / Lesser Horseshoe Bat (Rhinolophus hipposideros) hanging from wooden fence, National Park, Lefka Ori / White Mountains, Chania, Crete.

MYN / Emanuele Biggi / Lesser horseshoe bat (Rhinolophus hipposideros) adult sleeping, Grotta dell'Orso, Italy, January. Meetyourneighbours.net project

Paul Harcourt Davies / Lesser Horseshoe Bat (Rhinolophus hipposideros) hibernating in an Etruscan tomb, Podere Montecucco, near Orvieto, Umbria, Italy, October