Freedom of Information (FoI) requests revealed 63 possible sightings of Tasmanian tigers and big cats in Victoria, including a Parks Victoria report into multiple tiger sightings in the Warrandyte State Park, to the north of Melbourne.

Other repeat sightings of Tasmanian tigers in the same period centred around Wilsons Promontory National Park, in the south-east, and the Grampians range, in the west.

The last known Tasmanian tiger, or thylacine, a dog-like marsupial with tiger-like stripes, died in captivity in Hobart in 1936 and was believed to have been extinct on the Australian mainland for 2,000 years.

Melbourne researcher Michael Moss, who made the FoI requests to the Department of Sustainability and Environment (DSE) and Parks Victoria, said the government was ignoring strong anecdotal evidence the Tasmanian tiger was alive and breeding in Victoria.

But Moss said several recent sightings were made by credible witnesses, who gave detailed descriptions of the striped marsupial.

Many more reported sightings were ignored by sceptical park rangers and never officially recorded, he said.

"If this was in Tasmania there would be the biggest hunt on ever -- but because it was in Victoria no one takes it seriously," he said.

"I think every bushwalker down on the promontory and in the Grampians has a right to know these animals might be there."

Parks Victoria officer Glen Jameson, who compiled reports of thylacine sightings in the Warrandyte area between 1991 and 1999, said they could be an example of "mass sociogenic illness".

But he believed they were noteworthy because the people spoke with conviction, sincerity and did not come forward "in an atmosphere of media hype regarding Tasmanian tiger fever".