Eurasian Serotine (Cnephaeus serotinus) lives in temperate forests across Europe and Asia. It feeds on insects and fruits. Its conservation status is Least Concern.
Fascinating facts about the Eurasian Serotine
- The serotine bat is the first mammal known to mate without penetration. Researchers reported that the male's penis is unusually long, measuring about 22 % of his total body length, which makes conventional intromission difficult. During copulation the organ is simply pressed firmly against the female's vulva, a behaviour likened to the cloacal kissing seen in birds. This unique reproductive mode sets the species apart from all other mammals.
- Each night a serotine bat commutes on average 6.5 km between its roost and feeding sites and can visit up to five distinct foraging areas. Foraging activity peaks at dusk with a secondary bout at dawn.
- The serotine bat employs three main feeding strategies: short, agile flights, picking insects off the ground, and aerial hawking. By hunting close to the surface, usually within 0-5 m of the ground, it can capture low-flying insects as well as those caught mid-air. Its diet consists largely of flying insects such as butterflies and moths, which it catches while hovering or swooping. This versatile approach lets it exploit diverse prey types across its habitats.
- During the summer months the serotine bat prefers to roost in buildings rather than trees, showing a strong affinity for older structures that have high gables and cavity walls. Churches are a common choice, while modern constructions are visited only rarely. Bats usually slip into the roost at the top of the gable or through the lower eaves, giving them quick access to the interior.
- The serotine bat navigates and hunts using echolocation calls that sweep from 25 kHz up to 55 kHz, concentrating most of their acoustic energy around 31 kHz. Each pulse lasts roughly 8.8 ms, a timing that allows the bat to detect tiny insects close to the ground. These frequencies are well suited to the bat's low-altitude foraging style, which typically occurs within five metres of the surface.
Sources
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At a glance
RangeEurope and Asia
HabitatTemperate forests
DietInsects and fruits
About the Eurasian Serotine
In the twilight hours, the Eurasian Serotine bat takes to the skies, its leathery wings beating with a soft whoosh as it dances through the shadows, a master of the crepuscular realm. With echolocation calls that pierce the fading light, this diminutive creature navigates the intricate landscape of trees and buildings, its agility and cunning allowing it to thrive in a world of human dominance. As it flits and weaves, its dark silhouette is punctuated by fleeting glimpses of chestnut-brown fur, a fleeting reminder of the beauty that lies just beyond the reach of our everyday perception.
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