The Isthmus of Panama
2.8 million years ago the Isthmus of Panama was formed and biodiversity exploded as the currents rearranged
Source: Museo de la biodivesidad, Ciudad de Panamá, Panamá
Image by Chiche Ojeda under CC BY-SA 4.0 license
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Full disclosure, I may occasionally borrow a sentence from Will Durant's Story of Civilization. I absolutely love that collection!