アメリカ自然史博物館のインスタグラム(amnh) - 1月20日 07時19分

With their isolation and unchanging borders, islands can serve as useful laboratories for the study of evolution. One of the reasons for this is that when some species arrives on an island, individuals will take advantage of different ecological niches—some may make their living in treetops, while others may settle near a riverbank.
Over time, these different lifestyles can result in new adaptations, and over the course of many generations, the single species that arrived can evolve into numerous distinct animals—a process known as “adaptive radiation." Creative Commons/J. Surrey

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