During a hike with my friend, I noticed a black bird roosting in a nearby tree. “I’ve always wondered what the difference is between a crow and a raven,” I said.
“You have to count the pinion feathers on the wings,” my friend explained. “If there are four, it’s a crow. If it’s five, it’s a raven.”
“Really?” I said, although I knew he didn’t have a clue what he was talking about.
“Oh yes,” he replied. “The difference is just a matter of a pinion.”