What is the difference between a hen with one wing and a hen with two wings?
A difference of o ‘pinion.
Text
In nothing is the doctrine of the survival of the fittest more aptly illustrated than in conundrums or riddles. ... An old one is almost of necessity a good one. Updated daily. Collected by John Ray Frederick J. Drake & Company Publishers Chicago, 1902
Chit-Chat of Humor, Wit, and Anecdote
Conandrums New and Old: Riddels, Puszles, and Gags