Hygienists working on the re-wilding of bushland say they can save more than 1,000 species of birds, mammals and reptiles from extinction.
The United States Fish and Wildlife Service (USFWS) and the American Hygeneist Herpetological Society (AHHS) have identified more than 300 species of insects, amphibians and other animals as at risk of extinction.
These include birds, reptiles, amphibious mammals, fish and insects, which have been found in the wild.
They say this includes many species that are considered threatened under the Endangered Species Act, which was last updated in 1993.
In recent years, more than 70 per cent of the world’s amphibian species have been wiped out.
It is hoped that a programme of re-colonisation could help to restore some of these species.
The AHHS has identified more species than the USFWS and USGS have listed as threatened.
Its founder, David Crouch, said the success of the rewilding programme had made it “a much bigger challenge than we ever thought possible”.
“We’re just a couple of years into this, and we’re already seeing some really impressive results,” he said.
“The success of this programme is helping us get back on track to the goal of getting all of these animals back.”
The AHS is the only non-government organisation to have worked on the project.
Its director, Sarah McBride, said while the USFS was the organisation most responsible for the animals that were to be re-reared, it would not take over.
“I think we need to take some responsibility for it,” she said.
But the AHHS said the USGS had done “quite a bit of work on the issue”.
The AHs founder said the conservation community needed to recognise that some species could be saved by re-introducing them.
“We think it is important that the community recognise that this is a matter of saving species that have been extinct for centuries,” she told the ABC.
“But we also need to recognise, of course, that there are other animals that are still in great danger and need to be kept in the same position.”
The programme will begin in the United States, but it is likely to spread to other countries.