Rapid decline stumps researchers, who theorise traffic collisions, climate crisis, cane toads and inbreeding could play a role

Numbers of spotted-tail quolls in north Queensland have dwindled to critically endangered levels, new research into the threatened marsupials suggests.

Over two years, scientists monitored populations of the north Queensland subspecies of the spotted-tail quoll, Dasyurus maculatus gracilis, which lives in cool regions at high elevation.

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