How Big Are Houseflies?

Q: How big are houseflies?
A: My fingernail is the size of a cow.
You see, houseflies are both small, and big. They seem small, the size of a fingernail, but when you slowly sneak your eye in real close to observe one cleaning her face with her teensy hands, they look big. Cow size, with a cute fuzzy behind. So, the long answer is that houseflies are the size of the nail on my index finger and also of a cow. Using a variant of Pythagoras’s Theorem, a2 + b2 = c2, we arrive at the final answer.
You could see a different viewpoint at Wisegeek.com, but why?
See also: Why I Hate Flies | Fly image from GNU
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