What did the buffalo say when its child left for college?

This joke hinges entirely on a classic comedic device: wordplay. The humor comes from the punchline, "Bison," sounding exactly like "Bye, son." It's a simple phonetic trick that cleverly twists the name of the animal into a parental farewell. The unexpected use of the animal's alternative name, American Bison, to create a human sentiment is what makes the setup and punchline click for a quick laugh.

The joke plays on our understanding of both animal names and common human experiences. While we often use "buffalo" and "bison" interchangeably, the joke specifically uses "bison" to deliver its pun. The idea of a massive, wild animal like a buffalo having a child go off to college and then uttering such a human, sentimental parting phrase is inherently absurd and unexpected, adding another layer to the humor. It's a lighthearted take on a universal parental moment, transplanted into the animal kingdom for a giggle.