sentences:  The closing of the Central American Seaway is also supported by the evolution of taxa on different sides of the Central American Isthmus along with the different histories of the oceans on either side of the isthmus.The closing of the seaway allowed a major migration of land mammals between North and South America, known as the Great American Interchange.This allowed species of mammals such as cats, canids, horses, elephants and camels to migrate from North America to South America, while porcupines, ground sloths, glyptodonts and terror birds made the reverse migration.