From a psychological point then, animals have evolved to be nice to their kin, particularly their children, and particularly in birds and mammals.
从心理学角度看,动物进化趋向于对自己的亲人有益,特别是自己的孩子,以鸟类和哺乳类为代表。
Birds and mammals invest in quality and not quantity, as opposed to fish and reptiles.
鸟类和哺乳类靠质生存,而非以量取胜,这与鱼类和两栖类不同。
For birds and mammals, we don't have many kids but so we devote a huge amount of psychological energy to protecting the ones that we have.
鸟类和哺乳类,没有很多孩子,所以我们用大量的心力,去保护我们有的孩子。
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