Riel-Salvatore rejects the theory that they were exterminated by modern humans. Homo sapiens might simply have existed in larger groups and had slightly higher birthrates, he said.
And now they're gone. See what happens when you don't have good immigration controls.
6 posted on 09/21/2010 4:55:05 PM PDT by Inappropriate Laughter
(Obama: Another illegal alien living in public housing)
There are modern groups of humans that have a built in population control ~ although some males have exceedingly successful sperm, the aggregate population suffers from a 50% rate of indeterminate infertility.
The Neanderthals could well have suffered the same problem, and could also be the source of this problem in modern populations.