Gould's Long-eared Bat

Fascinating facts about the Gould's Long-eared Bat

• Those ears aren't just for show — they're acoustic mirrors 40% the length of the bat's entire body. Gould's long-eared bats fold them down like origami when roosting to save heat, then unfurl them in flight to catch the ultrasonic echoes of mosquitoes and moths moving through rainforest air. The asymmetrical placement means each ear hears prey at slightly different times, letting the bat triangulate position in complete darkness with millimetre precision.
• A Gould's long-eared bat weighs about 3 grams — roughly the mass of two grains of rice — yet hunts while hovering inches from foliage in cluttered forest. Most bats echolocate at frequencies below 100 kHz; this species pushes past 140 kHz, trading distance for detail. The higher the frequency, the finer the echo portrait of a web-spinning spider or a burrowing beetle larva, but the sound travels only a metre or two before fading.
• Unlike their relatives that hunt mid-air, Gould's long-eared bats are gleaning specialists — they pluck spiders from their webs and insects from leaves while barely slowing down. Scientists discovered they can discriminate between the sound of a leaf rustling and the sound of an insect walking on that same leaf, filtering out noise that would paralyse other hunters. It's the acoustic equivalent of a surgeon working in a thunderstorm.
• These bats roost in tree hollows, rock crevices, and old mines across eastern Australia, often clustering in tight social groups of up to 50 individuals. A single roost can remain occupied for generations — researchers have tracked continuous populations in the same caves for over 60 years. Loss of mature hollow-bearing trees and cave access now threatens colonies that have fished the same forest streams for centuries.
• Female Gould's long-eared bats are pregnant for only 42 days before giving birth to a single pup that weighs nearly a third of the mother's own body weight. That pup is weaned and hunting independently within 8 weeks — a compressed timeline that forces mothers to double their feeding rate through late pregnancy and lactation. The metabolic cost of producing and nourishing a pup that enormous is why birth timing must align perfectly with peak insect abundance.

At a glance

About the Gould's Long-eared Bat

In the warm, golden light of dusk, the Gould's Long-eared Bat stirs, unfolding its delicate, almost translucent wings like a dark, leathery cloak, as it prepares to take to the evening skies. With a fluttering, erratic flight, it dances through the trees, its oversized ears twitching with every subtle nuance of sound, guiding it with unerring precision to the faint, high-pitched calls of its insect prey. As it hunts, its very presence seems to embody the whispered secrets of the night, a fleeting, mysterious apparition that vanishes as suddenly as it appears.

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