“South America had been an island continent, far bigger and far more diverse than Australia, for tens of millions of years before the Isthmus of Panama rose just a couple of million years ago. The resulting flood of North American mammals across the new land bridge corresponds in time with the decimation of the native South American fauna. In fact, most large mammals generally considered distinctly South American… are all recent migrants from North America.”

— Stephen Jay Gould , book Leonardo's Mountain of Clams and the Diet of Worms

"Can We Truly Know Sloth and Rapacity?" pp. 390
Leonardo's Mountain of Clams and the Diet of Worms (1998)

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Stephen Jay Gould 274

American evolutionary biologist 1941–2002

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