How burnt coconut helped discover new to science endemic species in Sri Lanka

Researchers trapping small mammals near Puwakpitiya village in Sri Lanka's Knuckles Range caught two unusual female mice in March 2004 after peanut butter failed and burnt coconut succeeded as bait. The animals resembled the known Mayor's mouse but differed in tail length and skull shape, and it took more than two decades of genetic and morphological work to confirm they were a new species, now named Mus dumbara.

The species is distinguished by a tail longer than its body, pinkish-white toes, and DNA divergence of more than 11.7% from its closest relatives. Follow-up trapping in 2014 and 2015, despite nearly 1,900 trap nights, failed to turn up another specimen, leaving its population and range essentially unknown.

Scientists involved say Sri Lanka's small mammals remain understudied compared to frogs, lizards, and crabs, and that the Knuckles Range's protected status doesn't guarantee attention to less visible species. Researchers are calling for island-wide surveys and a broader taxonomic review before anyone can say how many mice like this one are still out there, or how much longer they will be.

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