Xenarthrans developed and diversified extensively in South America during its long period of isolation, invaded the Antilles by the early Miocene, and then spread to Central and North America starting about nine million years ago, as part of the Great American Interchange.
Xenarthrans developed. Xenarthrans diversified extensively in South America during its long period of isolation. Xenarthrans invaded the Antilles by the early Miocene. Xenarthrans spread to Central and North America. These Central and North America were starting about nine million years ago. This was as part of the Great American Interchange.