In August 2014 an international research team reported (in Nature 512, pages 306–309 [ paywalled ] ) on a new analysis of 40 sites in Western Europe - concluding that Neanderthals died out about 40,000 years ago.
There are numerous theories which attempt an explanation of their extinction - including :
As yet, no theory has been universally accepted by experts in the field. The explanation could be a combination (or none) of the above.
Further reading Wikipedia
Also see Neanderthal behaviourplugin-autotooltip__plain plugin-autotooltip_bigNeanderthal behaviour
"Almost everything about Neanderthal behaviour remains controversial.
Source : Wikipedia"
Despite very extensive research using the fossil record and remains of artefacts, it's still unknown whether the Neanderthal people :
* Used language