Until the Panamanian isthmus formed about 2. 8 million years ago, North and South America were isolated continents with unique groups of animals. A riot of marsupials—mammals with brood pouches—and sloths in the south contrasted with camels, horses, pronghorn antelopes and saber-toothed cats in ...

Source: [Phys.org](https://phys.org/news/2026-07-north-south-america-mammals-intermingle.html)

Sponsored