Ranger: When you walk on this path you should periodically ring a bell. This will warn the bears that you’re in the vicinity and they wont attack.
Tourist: How will we know that there are bears in the vicinity?
Ranger: You’ll see fresh faeces on the path but you wont see the bears.
Tourist: I understand that grizzly bears sometimes come down the mountain. How will I know the difference between brown bears and grizzlies?
Ranger: If it’s a grizzly you’ll see little bells in amongst the faeces.