by 
Slim746
ANSWERS: 2
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Don't really know, but I'd guess it's because roosters are known to perch on the roof to crow.
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It comes from the tradition of having the image of a cockatrice near the top of a building or the creature that could repel a cockatrice, a rooster crowing for protection. Supposedly if a cockatrice heard or saw a rooster it would leave. So they got placed on building for protection, called a weather cock.
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