“If it looks like a duck, and quacks like a duck, we have at least to consider the possibility that we have a small aquatic bird of the family Anatidae on our hands.”
Dirk Gently's Holistic Detective Agency (1987)
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Douglas Adams 317
English writer and humorist 1952–2001Related quotes
“If it looks like a duck, quacks like a duck, it's a duck!”
Source: Crisis

Regarding Communists; hearing before the Senate Committee on Labor and Public Welfare (1953)

" Design for Living http://www.nytimes.com/2005/02/07/opinion/07behe.html", New York Times, 7 February 2005.

"Fishing for a Living"
The Life of Birds (1998)

1997 Chairman's Letter http://www.berkshirehathaway.com/letters/1997.html
Letters to Shareholders (1957 - 2012)

“I shall never eat duck again. I cannot believe I used to like duck. The duck betrayed me.”
Source: Vampires, Scones, and Edmund Herondale