It turns out that chimpanzees and gorillas can form lasting friendships

[wnylib]

3. Maybe this is how Homo sapiens and Neanderthals

acted when they encountered each other, resulting in us having Neanderthal genes. Of course, we were more closely related than gorillas and chimps are, who cannot interbreed.

Sapiens and Neanderthal probably exchanged customs and technologies. Maybe some of the things that we take credit for developing in that time period actually came from Neanderthals.

Cooperation is just as important in evolution and survival as competition. Even though Neanderthals are gone as a separate subspecies, they live on in us today.