A Harvard scientist is reportedly looking for an "adventurous woman" to give birth to the first Neanderthal baby in 30,000 years.
US geneticist George Church told German newspaper Der Spiegel he was close to being able to clone a Neanderthal but would need a human woman to lend her womb to the project.
But the birth may not be quite what a human woman was used to, Gawker reported.
While Neanderthal children didn't need to rotate to get to the birth canal, their mothers generally had a wider birth canal than human women.
The baby would also be expected to have a longer head than a human child.
But despite the potential birthing difficulties, Professor Church said Neanderthal children could be very intelligent and may become a craze.
"Let's say someone has a healthy, normal Neanderthal baby," he told Bloomberg Businessweek last year.
"Well, then, everyone will want to have a Neanderthal kid.
"Were they superstrong or supersmart? Who knows.
"But there's one way to find out."
Professor Church has collected enough DNA from fossil bones to reconstruct Neanderthal DNA.
He said new technologies made the cloning project a realistic dream.