Lesser Horseshoe Bat

Adventure step • Meet the species

Overview

The lesser horseshoe bat is Europe's smallest bat species and one of the most distinctive. Weighing just 4-7 grams (about the weight of a sugar cube) with a wingspan of 19-25 centimeters, this tiny mammal is perfectly adapted for life on the wing. The species gets its name from the characteristic horseshoe-shaped nose-leaf that surrounds its nostrils. This unique facial structure acts as a parabolic reflector, focusing the ultrasonic calls used for echolocation. Unlike most bats that emit calls through their mouths, horseshoe bats use their noses, making their echolocation system remarkably efficient. The bat's fur varies from grey-brown to reddish on the back, with a paler underside. The ears are relatively large and pointed, and the broad wings give the bat an exceptionally maneuverable, almost butterfly-like flight. It can even hover in place while catching insects. The lesser horseshoe bat has developed a unique hunting strategy called 'perch hunting,' where it hangs from twigs or rocks and waits for prey to fly past before making a swift attack. During summer months, the species inhabits cave entrances, old buildings, bridges, and rock crevices where it forms colonies. Females gather in maternity roosts to give birth, while males typically live more solitary lives. In winter, they seek humid caves and cellars with stable temperatures between 2-9 degrees Celsius. Here they enter hibernation and can reduce their heart rate from 400 beats per minute to just a few. The lesser horseshoe bat is threatened throughout much of its range due to habitat loss, disturbance at roost sites, and declining insect populations. The species is particularly sensitive to disturbance during hibernation, as repeated awakening can deplete fat reserves and lead to death. In Sweden, the species is extremely rare with only sporadic observations, but it occurs across Europe from Ireland and southern England to the Mediterranean and east to the Caucasus.