Three doctors are in the duck blind and a bird flies overhead. The general practitioner looks at it and says, "Looks like a duck, flies like a duck... its probably a duck," shoots at it but misses and the bird flies away. The next bird flies overhead, and the pathologist looks at it, then looks through the pages of a bird manual, and says, "Hmmmm...green wings, yellow bill, quacking sound...might be a duck." He raises his gun to shoot it, but the bird is long gone. A third bird flies over. The surgeon raises his gun and shoots almost without looking, brings the bird down, and turns to the pathologist and says, "Go see if that was a duck."
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