To begin with, 65 million years ago was the start of the Paleocene epoch that was the establishment of the tertiary period on earth. Due to the extinction of the dinosaurs during the previous period, there was a heap amount of mammals accumulating and evolving from their original size and aspects. Many forms of animals existed big, small, and of many different sizes; rapidly increasing in numbers by reproduction. In this epoch, carnivores were very large in numbers. For example, a bird that was one of the top predators during this time was the Phorusrhacids known as flightless birds or terror birds. These birds were associated and evolved from the preceding time when dinosaurs were still alive and not extinct. These were comparable and evolved
