During the Tertiary Period?

The Tertiary Period began about 66 million years ago with a mass extinction that 'clocked' the dinosaurs and ended when the ice ages of the Quaternary Period began, about 2.6 million years ago. These dates have been adjusted as science advances or when new evidence is found.

What lived during the Tertiary period?

During this time mammals diversified quickly. Some examples are marsupials, insectivores, bears, hyenas, dogs, cats, seals, walruses, whales, dolphins, early mastodons, hoofed mammals, horses, rhinoceroses, hippopotamuses, oreodonts, rodents, rabbits, monkeys, lemurs, apes, and humans (Australopithecus).

What are the characteristics of life during Tertiary period?

It is subdivided into the Palaeocene, Eocene, Oligocene, Miocene, and Pliocene epochs in ascending order. The Tertiary period was characterized by the rise of the modern mammals and the development of shrubs, grasses, and other flowering plants.