This allowed the entrance of species of mammals such as cats , horses , elephants and camels to migrate from North America to South America .
The closing of the seaway allowed a major migration of land mammals between North and South America or The Great American Interchange .
This allowed the entrance of species of mammals such as cats , horses , elephants and camels to migrate from North   to South America .
The closing of the seaway allowed a major migration of land mammals between North and South America or The Great American Interchange .