A Canadian park ranger is giving some ramblers a warning about bears, “Brown bears are usually harmless. They avoid contact with humans so we suggest you attach small bells to your rucksacks and give the bears time to get out of your way. However, grizzly bears are extremely dangerous. If you see any grizzly-bear droppings leave the area immediately.”

“So how do we know if they’re grizzly bear droppings?” asks one of the ramblers.

“It’s easy,” replies the ranger. “They’re full of small bells.”