The documentary series reaches the Cretaceous period, 75 million years ago, when Earth was dominated by the last generation of gigantic carnivores that took killing to a new level. They included the daspletosaurus, which hunted in gangs and used its highly developed smell and hearing to take down opponents like the horned rhino-sized chasmosuarus. Also featured is the sharp-toothed majungasaurus, a predator of much smaller creatures that would occasionally turn cannibal and hunt its own kind