The second half of the Age of Mammals yields many stories worth telling. The one that I find grandest and most central, however is the “Savanna Story.” While featuring it as the principle theme, I hope to weave in the following secondary subjects:

1) the adaptive radiation of four representative groups, namely hypsodont horses, camels, elephants and cricetid rodents;

2) intercontinental dispersal patterns across Beringia and between the American continents;

3) and faunal turnover patterns.