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为何狗改不了吃屎却不吃自己的？粪便新鲜程度很重要
source link: http://tech.sina.com.cn/d/2018-01-29/doc-ifyqzcxh7556986.shtml
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新浪科技讯北京时间1月29日消息，据国外媒体报道，俗话说“狗改不了吃屎”，可见这是一个多么常见的现象。狗在这方面确实热情十足，尽管它们的主人对此无比厌恶。近日，科学家对犬类取食粪便的行为进行了深入研究，对它们为何有这种习惯进行了解答。研究表
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