Если нажать на линк (вики), то можно прочитать: "Around 3–5 million years ago, the North American Camelidae spread to South America via the Isthmus of Panama, where they gave rise to llamas and related animals, and to Asia via the Bering land bridge."
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"Around 3–5 million years ago, the North American Camelidae spread to South America via the Isthmus of Panama, where they gave rise to llamas and related animals, and to Asia via the Bering land bridge."