The lesser horseshoe bat ranks among the tiniest bat species, with an adult mass of just 5 to 9 grams. Its wings extend 192-254 mm across and the body measures only 35-45 mm long, giving it a very compact silhouette. Strong feet let it cling securely to rocks and branches, and despite its tiny eyes it sees well enough to navigate its nocturnal world.
These bats navigate by emitting ultra-high-frequency calls that sweep from 93 to 111 kHz, concentrating most energy around 110 kHz, and each pulse lasts about 31.7 ms. The calls are produced from specialised round pads in the mouth, allowing precise targeting of tiny insects during flight. Because the frequencies sit close to those of the Mediterranean and Mehely's horseshoe bats, their echolocation spectra overlap with those relatives.
Most lesser horseshoe bats shift only a few kilometres between seasonal roosts, typically moving 5-10 km as winter approaches. Nevertheless, an exceptional individual was recorded travelling 153 km from its summer cave to a winter site, far exceeding the usual range. This rare long-distance movement highlights that, while generally sedentary, the species can occasionally undertake extensive migrations.
In the UK the species has surged, rising 4.5% each year from 1999 to 2012. That steady growth added up to a 77.2% total increase over the period, signalling a rare positive trend for bats.
A 2011 discovery revealed a Tunisian maternity colony nesting under the roof and rooms of an abandoned hotel. This behaviour defies the usual preference for caves or mines, suggesting new sites may hide hidden colonies.
Sources
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In the velvety darkness of a summer evening, the Lesser Horseshoe Bat unfurls its delicate wings, a whispered promise of mystery and wonder, as it takes to the skies with an effortless flutter, its high-pitched calls echoing through the landscape like a gentle breeze. With each nimble beat, it navigates the intricate tapestry of its surroundings, a masterful weaver of sound and shadow, as it pursues the unsuspecting insects that dance in the fading light. As it flits and darts, its remarkable, horseshoe-shaped noseleaf trembles with an almost imperceptible intensity, guiding it through the darkness with an uncanny precision.
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