Comment by switknee

I believe you're confusing knowledge and intelligence. This is effectively like saying intelligence is circumstantial because Mike Tyson could punch through the mathematician's head in the boxing ring. You're comparing an ability (intelligence) to a skill (jungle stuff).

To accurately test the jungle guy's intelligence you'd need to devise a test that doesn't require reading nor writing (skills he hasn't yet developed). The point is to test how well his brain works, not what he's learned. With physical testing there are similar situations, where two people can have the same strength and endurance but one of them can achieve more with it due to certain skills like dance or being Mike Tyson.