Bird Joke

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A family practitioner, an internist, a surgeon, and a pathologist went duck hunting. They decided to take turns shooting. The first flock of birds flys over, the F.P. raises his gun, says "It's a duck!" and fires, bringing down a bird. The next flock flys by, the internist raises his gun and says, "It's a duck...no, it's a goose...no, it's a swan...", and while he's saying this the birds fly away. The next flock flys by,the surgeon raises his gun, doesn't say anything, just blasts away. A bird falls out of the sky, the surgeon turns to the pathologist and says, "OK, what is it?"