For the terrestrial fauna in the Americas, the formation of the Central American land bridge 4 million years ago led to

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The formation of the Central American land bridge allowed for the exchange of fauna between South and North America, which is known as the Great American Biotic Interchange. This event is considered one of the biggest biogeographical events in the history of the planet, as it facilitated the migration of many species between the two continents.

For the Terrestrial Fauna in the Americas, the Formation of the Central