Leschenault’s Rousette

Fascinating facts about the Leschenault’s Rousette

• A fruit bat with a 30-centimetre wingspan can echolocate using clicks made with its tongue — the only bat genus that does this. Most bats use their larynx to produce echolocation calls; Leschenault's rousettes are the rebels, clicking their tongues up to 10 times per second to navigate rainforest darkness and find ripe fruit. This click-based sonar works so well they thrive in caves where light never reaches, turning sound into sight.
• These bats roost in colonies of up to 10,000 individuals in caves across Southeast Asia, and they can find their way back to the exact same spot every dawn after a night of foraging up to 40 kilometres away. They memorise landmarks using vision during dusk and dawn, then switch to tongue-clicks once darkness falls — a neural switch between two navigation systems that neuroscientists are only now beginning to understand.
• A Leschenault's rousette's stomach ferments fruit so efficiently that seeds pass through their digestive tract still alive and ready to germinate — they are living seed dispersal machines for tropical figs, mangoes, and wild cashew trees across the rainforest. Single colonies can spread seeds across hundreds of square kilometres in a night, reshaping the forest canopy in ways we're still mapping.
• Males gather in harems during breeding season and produce ultrasonic calls to attract females, each male's voice slightly different — a bat dialect scientists can now distinguish using sound analysis software. These calls are so high-pitched that human ears hear nothing, yet females can identify individual males by tone alone in a crowded cave of thousands.
• At dusk, Leschenault's rousettes perform a pre-flight ritual called 'tent-pitching' where they hang upside down and rapidly fold and unfold their wings, generating heat in their flight muscles before launching into the cool night air. This 20-second warm-up is essential in tropical rainforests where humidity is high and muscles cool quickly — without it, they cannot generate the power needed to fly through dense vegetation.

At a glance

About the Leschenault’s Rousette

In the twilight skies of Southeast Asia, the Leschenault's Rousette emerges as a dark silhouette, its leathery wings beating in a slow, deliberate rhythm as it navigates the dense forest canopy with ease. With eyes aglow like embers, this large fruit bat moves through the world with a quiet confidence, its agile form weaving between the trees in search of the ripest mangoes and figs. As it flies, the soft rustle of its wings and the sweet scent of its fruit-filled breath leave a subtle trail, a testament to the secret lives of these nocturnal creatures.

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