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who said featherless biped ?

### Plato and Diogenes: The Debate on the Definition of Man

In the annals of philosophy, one of the most enduring anecdotes is the comedic clash between Plato and Diogenes over the definition of man. According to third-century philosopher Diogenes Laërtius, Plato once boasted of defining man as a “featherless biped.” Amused and quick to highlight a flaw in Plato’s definition, Diogenes took a literal interpretation, plucked a chicken, and brought it to Plato’s Academy, proclaiming, “Behold, I’ve brought you a man.”

This anecdote encapsulates not only a lighthearted debate but also a broader question that has haunted philosophers for centuries: What defining characteristic truly sets humans apart from the animal kingdom?

### Plato’s Definition: Featherless Biped

Plato’s definition, as recounted by Diogenes Laërtius, came during a discussion in the Socratic tradition. Socrates, through his method of inquiry, would often pose questions and definitions to his students, including Plato. One of these exchanges resulted in the definition of man as a “featherless biped.” The term “biped” refers to animals that walk on two legs, which, at the time, included both humans and birds. By stripping away the feather, Plato aimed to distinguish humans from birds.

However, this definition was inevitably undercut by Diogenes’ clever response, turning what could have been a scientific discussion into a humorous exchange. Diogenes effectively exposed the inadequacy of Plato’s definition, illustrating that it could apply equally to stripped chickens. This episode is often cited in philosophy as an example of how oversimplified or literal definitions can fail to capture the complexity of human identity.

### Diogenes’ Retort: A Living Proof

Diogenes’ action was not arbitrary but a strategic one aimed at showing the fallacy in Plato’s definition. He highlighted that featherlessness was not a unique trait for humans; other beings, including birds, also lacked feathers, especially after the application of a plucking tool. By bringing a bare chicken to Plato’s Academy, Diogenes cleverly revealed the inadequacy of Plato’s definition.

The incident also speaks to the character of Diogenes, the notorious Cynic philosopher known for his wit and unorthodox lifestyle. He was known to eschew the comfortable life of an academic and lived a life of voluntary poverty, rejecting societal norms and expectations. His challenge to Plato can be seen as a typical example of his provocative methods, aimed at overturning conventional wisdom and encouraging critical thinking.

### The Legacy of the Featherless Biped

This exchange did not leave its mark simply in the annals of classical philosophy. The story has persisted, often used today to illustrate the potential pitfalls of defining unique human traits. Philosophically, it underscores the complexity of human nature and the difficulty in isolating a single quality that exclusively differentiates us from other species.

In modern times, the incident has become a celebrated symbol of the exchange between reason and irreverence in philosophy. It is also a testament to the wit of Diogenes, whose actions were as thought-provoking as his ideas.

### Plato’s Counter: Broad, Flat Nails

Responding to Diogenes’ challenge, Plato is said to have amended his definition, adding “with broad, flat nails.” This was an attempt to refine his characterization, making it more specific and less easily refuted. However, this alteration still fell short of capturing the full essence of humanity, making the story all the more poignant.

### Conclusion

The story of Plato and Diogenes serves not only as a humorous anecdote but also as a reminder of the complexities in defining human nature. It encourages us to think critically about the qualities that make us human. Whether it’s bipedalism, featherlessness, or something else entirely, the debate on the essence of humanity continues to be a central theme in philosophy.

Through this incident, we see the interplay between rigorous philosophical inquiry and the sharp wit of a provocateur. The exchange between Plato and Diogenes remains a classic example of how philosophy can often be as much about rhetoric and argumentation as it is about deep thinking and intellectual rigor.

So, the next time you come across a seemingly simple definition, remember the cautionary tale of Plato and Diogenes, and question whether it might also be as easily refuted by a featherless chicken.