|"What's the difference between the North American porcupine and the African porcupine," the society matron asked the zookeeper.|
"The principal difference is the North American species has a longer prick."
This, as you might assume, distressed the matron who stormed immediately to the zoo manager's office.
The zoo manager said, "Ma'am, I apologize for my staff's unfortunate choice of terms. What the keeper should have said is that the North American species has a longer QUILL. Their pricks are the same size."