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First of all, it's good to clarify that red meat refers to all mammalian muscle meat.

But actually the analysis is more subtle than that - because as societies become more wealthy, people often turn to muscle meat and reject the animal's offal.

Slicing a cow into retail cuts takes hundreds of minute judgments: identifying the fat that must be separated from muscle meat; separating out diseased, bruised, or bloodshot meat from fresh; and deciding whether to cut slightly thinner steaks in order to get one more cut of meat out of an animal, for instance.

Red meat refers to "all types of mammalian muscle meat," such as beef, veal, pork, lamb, mutton, horse — even goat.

It’s exactly what they’d do if they caught some prey – before they’d eat it they’d pluck the fur, or they’d pluck the feathers before they actually eat the muscle meat.