A What?

A young man visiting a dude ranch wanted to be "Macho", and went out walking with one of the hired hands. Walking through the barnyard, the visitor tried starting a conversation.

"Say, look at that big bunch of buffalos."

The hired hand replied, "Not 'bunch' but 'herd'."

"Heard what?"

"Herd of buffalos."

"Sure, I've heard of buffalos. There's a big bunch of 'em right over there."