The growling is growing in volume at the Bendigo Water Reclamation Plant in Epsom.
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Numbers of the threatened Growling Grass Frog have soared at the plant, according to a report received by Coliban Water in June.
More than 100 of the frogs were recorded as living at the site in January, compared to earlier counts which have been less than 30.
Once widespread across south-eastern Australia, numbers of the Growling Grass Frog have decreased over time.
In Victoria, it is now confined to a few sites in the centre of the state and Gippsland.
Named for its distinctive growl, it is one of the largest frog species in Australia.
Community operations manager at Coliban Water Mick Dunne said the organisation was committed to protecting the species.
“Our Bendigo Water Reclamation Plant has 67 hectares of lagoons and treatment ponds that have a high biodiversity value,” he said.
“It attracts thousands of birds of local and international conservation significance, and supports native flora and fauna.
“Our lagoons provide excellent habitat as they are dense with algae from nutrients and have ample rocks under which they are protected from predators and can emerge to feed.”
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