Neanderthal's large eyes cause extinction

A study of Neanderthal skulls suggests that they became extinct because they had larger eyes than our species.

As a result, more of their brains were devoted to seeing in the long, dark nights in Europe, at the expense of high-level processing.
Although they could see better humans had far better intelligence this meant that they could fashion warmer and sturdier clothing and form bigger social networks.
The research team suggests that the ancestors of the Neanderthals left Africa and migrated to Europe meaning they had to adapt to the darker longer nights. The result was that they had to evolve bigger eyes.