总之，黑白花的奶牛是家牛属的，牦牛也是牛属的是亚属；美洲水牛（American buffalo）和美洲野牛（American bison）是一回事，跟亚洲水牛不一样。
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The IFN-τgenes of different species fell into four groups by cluster analysis: cow, American bison and buffalo comprise one clade; sheep, goat and musk ox comprise another; gayal, red deer and musk deer comprise a third clade; giraffe comprise an entirely different clade.
不同物种IFN-τ基因可聚为4类：普通牛与美洲野牛、水牛聚为一类；绵羊、山羊、麝香牛聚为另一类；大额牛、马鹿、麝香鹿聚为第三类：长颈鹿单独为一类。
参考来源 - 牛干扰素·2,447,543篇论文数据，部分数据来源于NoteExpress
A hundred and fifty years ago, a plainsman could kill an American bison, cut out only the tongue for his dinner.
一百五十年前，平地居民杀死野牛，只割下牛舌头做晚餐。
European bison having a smaller and higher head than the North American bison.
欧洲的野牛，其头比美洲野牛的小且高。
An American bison stands in a field on the Tallgrass Prairie Preserve in Oklahoma.
一只北美野牛伫立在俄克拉荷马州的高草草原保护区。
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