Old Man Jingles
Rat out of a cage
Actually the Neanderthals had a bigger brain than homo sapiens.They lost out to homo sapiens in the evolution battle. Survival of the fittest. They had tiny brains and died off.
And I am just going off of my own personal observations
However, the superior ability of homo sapiens to communicate complex concepts and execute them as a group allowed them to kill off the Neanderthals.
The exception was Neanderthal women with big butts who were assimilated into the Homo sapiens' tribes.
That's why you have 2.5% of your DNA comes from Neanderthals.