In a report to be considered on Tuesday night, staff pointed to a study from the Office of Environment and Heritage from 1990 to 2013 across 17 sites across the country.

In all 17 cases, the flying foxes remained within a 20-kilometre radius from the original site and 63 per cent stayed within 600 metres.

In 16 cases, dispersals did not reduce the overall number of animals.

The report also stated the cheapest alternative was removing vegetation, costing in the tens of thousands of dollars, while more active methods such as noise and smoke cost in the hundreds of thousands.

The botanic gardens in Sydney and Melbourne have spent more than $1 million each, while the townships of Maclean and Charters Towers spent $400,000 and $500,000 respectively.

Staff also pointed to a 2011 report from Cenwest Environmental Services in response to councillor Kevin Duffy's request to net the affected poplars in Cook Park, saying no purpose-built rockets were available for such a project.

The report said they would need to be fired from nearby roadsides at a 90-degree angle.

"[It] would pose very significant [workplace health and safety] challenges and would likely be unsuccessful, and a very expensive trial," the report said.

"Furthermore they would not necessarily prevent flying foxes accessing trees where complete netting was not achieved, could entangle flying foxes and other native animals, thereby providing a public relations disaster."

Staff recommended a public education campaign instead.

Mayor Reg Kidd, who has been monitoring the bat numbers for the past three years, said there was still a reason to act, especially given they had not been roosting in native trees.

"We're trying to move them out of the park, not from the district," he said.

"I live three-and-a-half kilometres away, my place is covered with natives and I wouldn't mind having them here."

The flying foxes have roosted in Orange for the past three years, as well as in 2010.

They have mostly settled in March or April, except for 2018 when they arrived in January, but left by mid-May on all four occasions.

Numbers ranged from 200 to 5000.