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In a remote cluster of islands, off the tip of East Arnhem Land, Gurrumul's Toadlet is presumed to be croaking away with its unique 'squelching' call. The problem is no one's ever recorded it.
But that could change sometime this week when armies of citizen scientists get to work on a census like no other.
Friday marks the start of the fourth annual FrogID Week when nature lovers are encouraged to creep around their yards, local parks, and other green spaces listening for and recording the dulcet tones of Aussie frogs on a special app.
The initiative has been an extraordinary success in its short life, producing a 'game changing' data set used by scientists across the nation, says Jodi Rowley, the curator of amphibian and reptile conservation biology at the Australian Museum.
Australia's fourth annual 'frog census' will be held on Friday (above)
'In four years, we've almost doubled the number of frog records previously in Australia, that were collected over more than 200 years,' Dr Rowley says.
'FrogID has helped document range extensions in threatened species, it's helped discover populations of frogs that haven't been seen or heard of, or we didn't know were still around in certain places.
'And because frogs are such great indicators of
