http://news.yahoo.com/s/ap/20110302/...eastern_cougar

The "ghost cat" is just that.
The U.S. Fish and Wildlife Service on Wednesday declared the eastern cougar to be extinct, confirming a widely held belief among wildlife biologists that native populations of the big cat were wiped out by man a century ago.
After a lengthy review, federal officials concluded there are no breeding populations of cougars — also known as pumas, panthers, mountain lions and catamounts — in the eastern United States. Researchers believe the eastern cougar subspecies has probably been extinct since the 1930s.
Wednesday's declaration paves the way for the eastern cougar to be removed from the endangered species list, where it was placed in 1973. The agency's decision to declare the eastern cougar extinct does not affect the status of the Florida panther, another endangered wildcat.
Some hunters and outdoors enthusiasts have long insisted there's a small breeding population of eastern cougars, saying the secretive cats have simply eluded detection — hence the "ghost cat" moniker. The wildlife service said Wednesday it confirmed 108 sightings between 1900 and 2010, but that these animals either escaped or were released from captivity, or migrated from western states to the Midwest.
"The Fish and Wildlife Service fully believes that some people have seen cougars, and that was an important part of the review that we did," said Mark McCollough, an endangered species biologist who led the agency's eastern cougar study. "We went on to evaluate where these animals would be coming from."
A breeding population of eastern cougars would almost certainly have left evidence of its existence, he said. Cats would have been hit by cars or caught in traps, left tracks in the snow or turned up on any of the hundreds of thousands of trail cameras that dot Eastern forests.
But researchers have come up empty.
The private Eastern Cougar Foundation, for example, spent a decade looking for evidence. Finding none, it changed its name to the Cougar Rewilding Foundation last year and shifted its focus from confirming sightings to advocating for the restoration of the big cat to its pre-colonial habitat.