[WalterBright]

What humans have is leverage, due to having language. This is a giant intelligence multiplier. The next multiplier was writing. The next printing. The next is computer networks.

Communication gives us the ability to coordinate with and teach others, which is an incredible advantage. We can build on what other humans learn, rather than having to rediscover it.

I sometimes wonder why this ability is so limited in other intelligent animals.

For the Park Service, they can print instructions and put them on the garbage can, or a ranger can explain it to the person.