Silver-haired Bat (Lasionycteris noctivagans) lives in north American forests across North America. It feeds on insects and spiders. Its conservation status is Least Concern.
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A real field recording of the Silver-haired Bat, made in the wild.
Weighing just 8-12 g and measuring about 100 mm from nose to tail, the silver-haired bat is the size of a small mouse, yet its forearm stretches 37-44 mm, giving it a wingspan near 30 cm. Its tiny body packs the power to fly long distances while hunting insects over water.
From the southeastern Alaska in summer to the northeastern Mexico in winter, silver-haired bats travel a continent-spanning corridor. Their range includes Bermuda, Canada, the United States and Mexico, and they migrate through arid low-elevation zones en route.
After a 50-60 day gestation, females give birth to two pups that weigh about 2 g, roughly 30 % of the mother's body mass. The newborns cling to their mother for about 36 days before venturing out on their own. This slow, low-output reproductive strategy means each loss, whether from predators or human hazards, removes a large fraction of the next generation, making population recovery a long, fragile process.
Silver-haired bats are one of three tree bat species most often killed at wind farms, accounting for over 75 % of turbine-related bat deaths. New research shows 90 % of those fatalities stem from barotrauma: a sudden air-pressure drop makes lung sacs over-expand, bursting capillaries and causing internal bleeding, much like a scuba diver surfacing too fast. Because they rely on echolocation, they rarely collide with blades, yet this invisible pressure shock makes turbines a hidden, lethal trap.
Although most bats carry no rabies, the silver-haired bat is linked to the few recent human rabies deaths. In 2015 a Wyoming woman woke to a silver-haired bat on her shoulder, later developing ataxia, dysphagia and weakness before dying. Genetic tracing confirmed the virus came from that bat, underscoring how this single species can serve as a rare but deadly bridge for rabies to humans, prompting careful public-health monitoring.
Sources
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In the velvety blackness of night, the silver-haired bat emerges, its fur a mesmerizing mosaic of dark hues and silver tipping, as it takes to the skies with an effortless elegance, its leathery wings beating in a slow, hypnotic rhythm. With each delicate flutter, it navigates the forest's labyrinthine canopy, a masterful hunter tracking the faint whispers of insect life, its large ears attuned to the subtlest vibrations. As it dances through the darkness, its very existence a testament to the mysterious beauty of the nocturnal realm, this vulnerable creature weaves an enchanting spell, a reminder of the magic that still lurks just beyond the reach of human sight.
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