[SauronOfMordor]

Said differently, the ones who are shy of humans are the only ones who get to pass on their genes.

[marktwain]

Yes. Bears are also good at learning. Learning reinforces the genetic selection component.

[z3n]

This very thing is the reason why IF rare 'cryptid' hominids still exist in the wild, why it is so difficult to cross paths with them. Humans have been hunting the aggressive ones and the intrepid ones for so long, all that is left are the very very shy and clever ones who avoid humans at all cost.