但对于一些物种的消亡（如容易染病的岛屿鸟类 ） ， 我我们可以选择不去干预，因为现实地说，很难阻止它们被演化上“更高等”的模式（如能抵抗病原体的鸟类）取代。
Yet, when it comes to the decline of some species (say, disease-susceptible island birds), we may choose not to intervene, not least because, realistically, it would be hard to resist their replacement by evolutionarily “superior” models (such as pathogen-resistant birds).