"Bear bells" joke

A guy walks into this sporting goods store in Alaska,
immediately spies a rather haggard-looking old salt of
a store clerk sitting by the cash register.
"Hear ya got a lotta' bears 'round here?"
"Yep," answers the clerk.
"Big bears?"
"Yep."
"Mean bears?"
"Yep."
"Black bears?"
"Yep."
"GRIZZLIES???!"
"Yep."
"Got any bear bells?"
"What's dat?"
"You know, them little dingle-bells ya put
on yer backpack so bears know yer in
the perimiter so's they can runs away..."
"Yep. Over yonder..."
"Great. I'll take one fer black bears, and one fer grizzlies.
Say, how'd you know if yer in black bear country anyway?"
"Look fer scatt."
"Oh. Well, how how'd you know if there's GRIZZLIES???!"
"Look fer scatt."
"You just said that!"
"Yeah. But grizzly scatt's different."
"Well now, just what's IN grizzly scatt that's different?"
"Bear bells."