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Is that right? Are birds the same as mammals? I remember reading something about ZZ. Have to check that out.

Back in statistics class in university, the professor used to say, "flip a coin 10 times". then, "flip a coin 100 times". In other words, 50/50 is what happens over a long period of time, on average. When our "sample" is just this particular rooster and these few hens, perhaps, it can be...