We do know that it evolved several times in living birds, so that it may be just a parallel evolution of this feature.

我们确实知道它在现存鸟类中进化了几次，所以它可能只是这个特征的平行进化。

The range of human foods is not just a source of epicurean joy but a reflection of ecological and anthropological variety -- the consequence of tens of thousands of years of parallel yet independent cultural evolution.

范围广泛的人类食物不仅是享口腹之乐的源泉，也是生态和人类学多样性的反映——这是数万年平行而独立的文化进化的结果。