It's disturbing news for an admittedly ugly creature, which has a slimy tail, plumage-like gills and mouth that curls into an odd smile.

The axolotl is known as the "water monster" and the "Mexican walking fish." Its only natural habitat is the Xochimilco network of lakes and canals — the "floating gardens" of earth piled on reed mats that the Aztecs built to grow crops but are now suffering from pollution and urban sprawl.

Biologist Armando Tovar Garza of Mexico's National Autonomous University said Tuesday that the creature "is in serious risk of disappearing" from the wild.

Describing an effort last year by researchers in skiffs to try to net axolotls in the shallow, muddy waters of Xochimilco, Tovar Garza summed up the results as "four months of sampling — zero axolotls."

State police, who operate the Sands Casino Station inside the South Side Bethlehem facility, report "absolutely zero snakes in this place," Trooper William Ortiz said.

The rumor, as passed on to The Express-Times, indicates someone went to the doctor with what was believed to be a bite; the doctor said it's a snakebite and asked immediately whether the patient had been to the Bethlehem casino.

Sands Bethlehem, owned by Las Vegas Sands Corp., issued a statement today saying, "There have been no reported incidents of snakes on our property. We do not allow any animals on property with the exception of service animals."

The findings prompted a larger 2008 expedition, in which teams sampled 1,669 individuals, drawing blood, noting the locations, and marking the tortoises so they could be monitored after analysis. The work found 84 hybrids of Floreana ancestry — of which 30 were less than 15 years old — and 17 with Pinta ancestry. A follow-up expedition is planned for next year to search the area where those populations were concentrated, hoping to find pureblood individuals and bring them to a captive breeding center on Santa Cruz Island. If all goes well, those individuals will serve as founders of a restored population.

"Human activity may have led to the preservation of lineages of species thought extinct," Russello said.