The Age of Birds and Mammals
The Cenozoic Era marked the end of the dinosaurs and the
emergence of mammals and birds. Although primitive mammals and
birds first appeared in the Mesozoic era, it was not until the
Cenozoic Era that they really emerged as powers in the world.
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The Cenozoic Era is divided into two major periods.
- The Tertiary Period, starting 65 million
years ago, saw the end of the dinosaurs and the great rise of
mammals and birds to take the place of the dinosaurs. Many of
the creatures from the Tertiary Period are direct ancestors of
- The Quaternary Period, which began just
2 million years ago, marked the origin of humans as well as the
modern forms of the animals we see today.
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