Gray Bat (Myotis grisescens) lives in cave systems across Southeastern North America. It feeds on aquatic insects only. Its conservation status is Vulnerable.
Fascinating facts about the Gray Bat
- Gray bat numbers have bounced back from a low of 1.6 million in the early 1980s to an estimated 3.4 million by 2004, surpassing the roughly 2 million counted when they first earned federal protection. This rebound shows that targeted cave protection and habitat management can reverse steep declines, giving the species a chance to rebuild its once-abundant colonies across the Southeast.
- Only fifteen caves now host 95% of all hibernating gray bats, meaning fewer than five percent of the region's caves are used at all. In winter they cling to just 0.1% of available caves, while in summer they can occupy up to 2.4%, a razor-thin slice of habitat that makes any disturbance catastrophic. Their extreme cave-dependence turns each protected entrance into a lifeline for millions of individuals.
- When hunting, gray bats typically travel 12.5 km from their roost, but some individuals cover as much as 35.4 km in a single night. Banding work shows they prefer summer roosts within 2 km of water, yet they have been recorded flying up to 19 km to feed. These long foraging trips demand high energy, linking roost placement directly to survival and growth of juveniles.
- Gray bats can travel up to 500 km (310 mi) between summer and winter caves, though most migrations fall under 320 km (200 mi). One-way distances may be as short as 16 km or stretch beyond 322 km, showing a remarkable flexibility in seasonal movement. Such journeys test their fat reserves, and any loss of energy during hibernation can spell death during this arduous trek.
Sources
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At a glance
RangeSoutheastern North America
HabitatCave systems
DietAquatic insects only
About the Gray Bat
In the twilight skies above North America's southeastern waters, the gray bat dances on leathery wings, its gentle whoops echoing through the misty veil that rises from the lakes and rivers. With a fluid, almost ethereal motion, this diminutive creature navigates the darkness, its large ears and sensitive whiskers guiding it through the complex tapestry of sound and scent that fills its nocturnal world. As it flits and weaves, the gray bat's remarkable agility and endurance are a testament to its enduring presence in this fragile ecosystem, a presence that is all the more precious for being vulnerable.
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