Why do ducks have feathers?

The joke “Why do ducks have feathers? To cover their butt quacks!” is a playful use of homophones and the anatomy of birds. The humor hinges on the word “quacks,” which serves a dual purpose. Firstly, “quack” is the characteristic sound a duck makes. Secondly, when paired with “butt,” it phonetically resembles the word “cracks,” referring to the crevice of one’s rear end. The setup innocently inquires about the purpose of a duck’s feathers, leading the audience to anticipate a biological or straightforward answer. However, the punchline humorously subverts this by suggesting that the feathers are there to modestly cover the duck’s “butt quacks.”