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DENVER, Colorado (AP) -- If a group of prominent ecologists have their way, lions and elephants could someday be roaming the Great Plains of North America.

The idea of transplanting African wildlife to this continent is being greeted with gasps and groans from other scientists and conservationists who recall previous efforts to relocate foreign species halfway around the world, often with disastrous results.

But the proposal's supporters say it could help save some species from extinction in Africa, where protection is spotty and habitats are vanishing. They say the relocated animals could also restore the biodiversity in North America to a condition closer to what it was before humans overran the landscape more than 10,000 years ago.

Most modern African species never lived on the American prairie, the scientists acknowledge. But some of their biological cousins like mastodons, camels and saber-toothed cats, roamed for more than 1 million years alongside antelope and herds of bison until Ice Age glaciers retreated and humans started arriving.

The rapid extinction of dozens of large mammal species in North America -- perhaps due to a combination of climate change and overhunting -- triggered a landslide of changes to the environmental landscape. Relocating large animals to vast ecological parks and private reserves would begin to repair the damage, proponents say, while offering new ecotourism opportunities to a withering region.

The scientists' plan appears in Thursday's issue of the journal Nature. It is attracting interest from some influential circles, including CNN founder Ted Turner, America's largest private landowner. He owns huge ranches in several states to support his commercial bison operation and personal conservation initiatives.

But the plan is also generating criticism on both sides of the conservation debate.

"It is not restoration to introduce animals that were never here," said University of Washington anthropologist Donald K. Grayson. "Why introduce Old World camels and lions when there are North American species that could benefit from the same kind of effort?"

Others wonder whether people would support African lions making a home on the range, given the opposition to the reintroduction of native wolves in the rural West.

"Just when you think the world has gotten as weird as it can get, something like this comes along," said Steve Pilcher, executive vice president of the Montana Stockgrowers Association.

"I wonder how many calves or lambs it would take to feed a family of lions for a month?" Pilcher mused. "We sort of know what it takes for wolves, but something tells me we would be in a whole new ball game."

Some wildlife conservationists said the idea would further damage the prospects of both threatened species and Africa's hopes for sustainable economic development.

"Such relocations would affect future tourism opportunities for Africa," said Elizabeth Wamba, the East Africa spokeswoman for the International Fund for Animal Welfare in Nairobi, Kenya. "The welfare of the animals would have been reduced by transporting and exposing them to different eco-climatic conditions."

Critics also point to calamitous relocations of foreign species in Australia. Rabbits brought from Europe swarmed across parts of the Outback, and noxious cane toads brought from South America to control bugs in sugar cane fields killed native wildlife.

The authors of the new plan say they are not discouraged.

"We are not saying this is going to be easy," said Cornell University ecologist Josh Donlan, the lead author of the proposal. "There are huge and substantial risks and obstacles."

The plan grew from a retreat at Turner's New Mexico ranch -- a 155,000-acre property in the foothills of the Gila Mountains that contains a mix of ecosystems ranging from desert grasslands to pine forests.

Ecologists are using the ranch to experiment with reintroducing the Bolson tortoise to the region. These 100-pound burrowers were once found across the Southwest, but now survive only in a corner of northern Mexico's Chihuahuan Desert.

The scientists' discussion expanded to consider long-extinct Pleistocene species that have modern counterparts elsewhere in the world.

For example, a larger American cheetah once stalked pronghorn on these lands, with both species evolving special features that enabled them to accelerate to 60 mph. Today, pronghorns rarely are chased, except by the occasional pickup truck.

In Africa, modern cheetahs are being exterminated as vermin, with fewer than 2,000 remaining in some countries. Relocation could help both species retain important traits, the plan's proponents say.

Other living species that are counterparts to Pleistocene-era animals in North America include wild horses and asses, Bactrian camels, elephants and lions.

Donlan concedes that lions would be a tough sell to Americans.

"Lions eat people," he said. "There has to be a pretty serious attitude shift on how you view predators."

Jnyusa wrote:

All the ... what's their name - King Entertainment? ... all their amusement parks around the country have roaming lions within gated areas and the little safari buses take park visitors through the 'savannah.' That's been going on for thirty years at least, and I only know of two accidents, one involving a keeper. The bears in Smoky Mountain Natl Park and the free roaming wolves and cougars pose more of a danger to civilians than gated lions would pose.

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They say the relocated animals could also restore the biodiversity in North America to a condition closer to what it was before humans overran the landscape more than 10,000 years ago.

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Critics also point to calamitous relocations of foreign species in Australia. Rabbits brought from Europe swarmed across parts of the Outback, and noxious cane toads brought from South America to control bugs in sugar cane fields killed native wildlife.