This is a serious question in English cognitive linguistics: how can English-speaking peopel define a "bird"? I want to talk about this in cognitive view because it does not relate to any biological points. People have to find several "typical" birds then define a "bird",nothing to do with DNAs. Robin with a reddish breast is a "very typical" bird in Europe and North America, we use many "properties" of Robin to define a "bird", flying, singing, a beak,etc. Is "a reddish breast" a characteristic of birds,in your mind? I'm not sure whether it is a pure English question, please inform me if not.
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