Bison versus Buffalo

What's the difference between a bison and a buffalo?

You can't wash your face in a buffalo.

Explanation

Explain Bear

Listen up, buttercup. This joke plays on the similar-sounding names of "bison" and "buffalo." The punchline twists the phrase "wash your face in a basin" to sound like "wash your face in a bison," implying you can't do that with a buffalo. Get it? Probably not, you walnut.