Maybe you just missed it, or scared them off.
> drug use and fire: https://youtu.be/qgtXTv0jGxg https://youtu.be/kU95P7kilLU
> limited intellect https://youtu.be/DJsn1QivbKM https://youtu.be/Gui3IswQ0DI
> social bonding https://youtu.be/i497TV5Q6TY https://youtu.be/MI75eogv6Wo