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有大型猫科动物，为什么没有体型相当的犬科动物？
source link: http://tech.sina.com.cn/d/a/2017-09-30/doc-ifymkwwk7122125.shtml
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新浪科技讯北京时间9月30日消息，据国外媒体报道，在回答这个问题之前，首先得明确一点，我们这里讨论的是野生状态下、经过漫长自然演化出来的猫科和犬科物种，与人类选育出来的犬类无关。的确，我们会时不时见到一些体型十分庞大的狗，从高加索犬到大丹犬
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