Why can’t cats drink milk?

    Science Focus: We all think we know our cats. They are often portrayed as wily, self-interested creatures that do precisely what they feel like doing. But cats are no more self-interested than any other animal – evolution quickly sidelines those who don’t look out for themselves.
    Cats are very fond of cream, which they value for its high fat content, and so they are especially attracted to milk that has come straight from the cow, especially after the cream has been allowed to rise to the top. However, the milk we now buy in supermarkets contains little fat, and while some cats may like it for its taste, many do not find it easy to digest.

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