As migration approached, two elderly vultures doubted they could make the trip south, so they decided to go by airplane.
When they checked their baggage, the attendant noticed that they were carrying two dead raccoons. "Do you wish to check the raccoons through as luggage?" she asked.
"No, thanks," replied the vultures. "They're carrion."
[sent to me by my friend David Luberoff, who claims it is not original but won't tell me where he got it]