杂食动物相对来说并没有明显一致的结构特征,严格来说,它不能算作是一个动物类别,动物分类学上没有这一类别,它完全是根据动物的饮食习性而归纳出来的一类动物;简单地说,杂食动物最明显的特征就是这些动物“食物种类较多,既吃植物,也吃动物”。
棕熊是杂食动物,抓到什么吃什么。
Brown bears are omnivorous, eating anything that they can get their paws on.
人们曾一度认为杂食动物是罕见的,但最近的证据表明并非如此。
It was once thought that omnivory was rare, but recent evidence suggests otherwise.
像人类一样,猪是杂食动物。
Now these were important changes because humans of course can-- are omnivores and can eat both plants and animals, and therefore, the ability to secure nutrients from these different sources became very appealing to humans.
这些是很重要的变化,显然人类现在,是杂食动物,能够进食植物和动物,因为营养来源的多元化,对人类来说很重要
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