a male chicken is a rooster also know as a "cock" it is very terratorial, in some parts of the world they are bred for fighting , they are put into a small circular pit (cock-pit) to fight to the death and people bet on the winner, it is known as a "cock fight"
i think the term "cock-pit"was first used in small racing sail boats as the place where the crew sat to work the controls as it resembled the place where the roosters fought and was just carried over to airplanes when they came on the scene
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