Comment I thought this was proven? (Score 1) 536
Don't we already have examples of skeletons that are mixtures of Neandertal and Cro-Magnon features?
Also note that Cro-magnons had skull shapes somewhat similar to Neandertals (prognathous, low-browed, pronounced eyebrow ridges), although they had larger cranial capacity than contemporary H. S. sapiens; and they had the same kind of stature as Neandertals. Intermarriage/interbreeding between the two species would not have been inconceivable, and would not have needed all that much alcohol.
As to inter-fertility, isn't it genus, not species, that tends to be the barrier?