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Prehistoric

  • Early life

    The first life on Earth appeared not on land but in the oceans. There was not enough oxygen in the air to breathe and ultraviolet radiation, lethal to life forms, was still at...

  • Age of Dinosaurs

    The Triassic, Jurassic and Cretaceous periods, which lasted from 252 to 65.8 million years ago, are together known as the Mesozoic Era, but more commonly called the Age of...

  • Dinosaur species

    The dinosaurs were reptiles that had legs held upright beneath their bodies, rather than sprawling. They walked on either two legs or all fours. Most kinds had long tails, clawed...

  • How dinosaurs lived

    Dinosaurs can be divided into plant-eaters or meat-eaters, although some may have been omnivores: they ate both animals and plants. The shape of a dinosaur’s jaws or teeth...

  • Marine reptiles

    The dinosaurs lived only on land. But from the Triassic Period and on through the entire Age of Dinosaurs, various groups of large reptiles swam in the oceans. Most were hunters...

  • Pterosaurs

    Pterosaurs were flying reptiles. They first took to the air in the Triassic Period, and proceeded to dominate the skies for nearly 100 million years. They had wings formed by...

  • Age of Mammals

    By the time the dinosaurs became extinct, several different groups of mammals had already evolved around the world. The first mammals evolved during the Late Triassic Period. They...

  • Story of humans

    Humans first evolved from ape-like creatures in Africa. The first hominids (human-like beings) probably appeared over five million years ago. These early kinds are known as...

  • Timeline of Earth history

    Life probably arose about 3800 million years ago, although the earliest fossil evidence we have is 3500 million years old. No one knows how life began, but warm-water pools on...

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