It was the internecine warfare between the Neanderthals and the Neandertals that made them an easy prey to the Cro-Magnons.
Early Human Dined on Young Neanderthal
http://www.freerepublic.com/focus/bloggers/2278644/posts
Prehistoric cold case shows hints of interspecies homicide
http://www.freerepublic.com/focus/chat/2296945/posts
This one Bugs me:
Bunnies implicated in the demise of Neanderthals
http://www.freerepublic.com/focus/chat/2993359/posts