Why shouldn't we eat endangered species?

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Considering the tremendous success that using North American Bison as food has been toward their proliferation. why don't we do more of it? When I was a kid, bison were barely a few thousand and nearly extinct. Now some 30 years or so later. there are vast numbers of them. Once people stopped shooting them for fun(hardly could be called hunting)and people started raising them as livestock (for food and other cattle products)they became valuable. Why don't we do this with other potentially tasty endangered species(like various types of fish and fowl especially)?