The vagaries of nature and genetic disorders can and do create very rare, but perfectly natural, non-extraterrestrial, humans, ranging from primordial dwarfs to conjoined twins. There's even a famous two-headed woman, Abigail and Brittany Hensel, whose lives have been documented on various television shows. It's possible that, hundreds of years from now, a future version of Lloyd Pye or Brien Foerster will locate the Hensels' nearly unique skeleton and issue a sensational press release proclaiming it a new human species or even the result of alien breeding.
The mystery of Foerster's Peruvian skulls has been embraced by many, though skeptics abound. Sharon Hill, a researcher specializing in the public understanding of science and editor of the Doubtful News website, told Discovery News that the way the skulls' DNA results were released smacks of pseudoscience.
"This is an unconventional way of making 'groundbreaking' claims," Hill noted. "It's not supported by a university, but by private funding. The initial findings were released in this unprofessional way (via Facebook, websites and an Internet radio interview) obviously because Foerster and the other researchers think this is very exciting news," she said.