This Story is meant for Boy Scouts.
Decide for yourself if it is appropriate for your younger scouts or not.

One summer, a fellow from the big city was going on a camping trip into the Rocky Mountains. He got all his gear, made the drive, and was at a local shop just before starting his hike into the wilderness.
He says to the store clerk, "Say, do you all have bears around here?"

"Yep," replied the clerk.

"What kind?"

"Well, we've got black bears and grizzly bears."

The hiker replied, "OK, I guess I better get some of these bear bells then. That way, when I'm hiking the bears will know I'm coming and I won't startle them." He gets a couple bells and takes them to the counter to pay.

"By the way, is there any way to tell if there are grizzly bears or black bears around?", he asked.

"Sure," replies the clerk, " just check their scat to see what type of bear is around. You can tell the type of bear by what's in its scat."

"Hmmm, what would I expect to see in the scat?" asked the hiker as he picked up his bells to leave.

"Well, black bear scat's got berries, leaves, some grass. Grizzly bear scat's got bear bells."