That inbuilt instinct is quite an impressive trait..look at little song birds.they haven't been taught to make a nest.yet they do it generation after generation. It's weird how it's programmed into animals to perform such task's..
And yet it takes chimps 7 to 10yrs of watching an elder using hand tools like a rock to break open hard nuts. That isn't inbuilt into them..1 obviously worked it out though..