So based on this: http://www.huffingtonpost.com/2013/1...n_4302031.html
Normally Neanderthal is considered a different species from homo sapiens, so this might be yet another species getting into the sexy mix that is modern human.The ancient genomes, one from a Neanderthal and one from a different archaic human group, the Denisovans, were presented on 18 November at a meeting at the Royal Society in London. They suggest that interbreeding went on between the members of several ancient human-like groups living in Europe and Asia more than 30,000 years ago, including an as-yet unknown human ancestor from Asia.
...
The first Neanderthal and the Denisovan genome sequences revolutionized the study of ancient human history, not least because they showed that these groups interbred with anatomically modern humans, contributing to the genetic diversity of many people alive today.
All humans whose ancestry originates outside of Africa owe about 2% of their genome to Neanderthals; and certain populations living in Oceania, such as Papua New Guineans and Australian Aboriginals, got about 4% of their DNA from interbreeding between their ancestors and Denisovans, who are named after the cave in Siberia’s Altai Mountains where they were discovered. The cave contains remains deposited there between 30,000 and 50,000 years ago.
Science strikes against bestiality ... with close human species <-- is that the lesson?
(Note, the 'homo' in subject is derived from 'Homo sapiens' and 'Homo neanderthalensis' as per: http://en.wikipedia.org/wiki/Neanderthal, and the other group is also gotta be 'homo something')
hmm, another note: if the subject is offensive, please change to something like 'humans may be descendant of three species'