Chickens

A hen is only an egg's way of making another egg.

~ Samuel Butler

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According to the University of Wisconsin-Madison, today's chickens are likely a result of breeding between red junglefowl and gray junglefowl. Also, chickens became widespread because of their meat and eggs and the fact that they don't compete with humans, (and also because of cockfighting). 

Also, I would watch a competition between humans and chickens - sprints, Scrabble, standardized testing, whatever (but I would not watch cockfighting).