A few months ago, Matthew Warren wrote in the journal Nature:
A female who died around 90,000 years ago was half Neanderthal and half Denisovan, according to genome analysis of a bone discovered in a Siberian cave. This is the first time scientists have identified an ancient individual whose parents belonged to distinct human groups. The findings were published on 22 August in Nature.
“To find a first-generation person of mixed ancestry from these groups is absolutely extraordinary,” says population geneticist Pontus Skoglund at the Francis Crick Institute in London. “It’s really great science coupled with a little bit of luck.”
The team, led by palaeogeneticists Viviane Slon and Svante Pääbo of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, conducted the genome analysis on a single bone fragment recovered from Denisova Cave in the Altai Mountains of Russia. This cave lends its name to the ‘Denisovans’, a group of extinct humans first identified on the basis of DNA sequences from the tip of a finger bone discovered2 there in 2008. The Altai region, and the cave specifically, were also home to Neanderthals.
How did this happen? The usual way. Neandertals and Denisovans were hanging out in the same cave as darkness fell. Firelight danced on the features of a fetching Neandertal lass and a pair of Denisovans on the edge of the dark took notice.
"I could so do her."
"Forget it. Totally out of your league."
"Out of my what? What's a 'league,' what does that even mean?"
"I have no idea, but it doesn't change anything. She's Neandertal. She will never hook up with a Denisovan."
"Yes she will."
"No she won't."
"Hold my beer."