DinoNaviDinosaur & Prehistoric Life Encyclopedia
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Estimated lengths only; this chart does not represent posture or height. Species from different periods may appear together and did not necessarily coexist.

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Research-based estimates · Length and height are different measures. Candidate classifications and estimates may remain provisional. Check each source account.

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  • Animal beside eggshells (imagined reconstruction; proportions unverified).

    The Life of Tyrannosaurus rex: From Tiny Hatchling to Giant Predator

    Around 66 million years ago, one of the most formidable predators in Earth's history roamed western North America. Yet even Tyrannosaurus rex began life small, vulnerable, and far removed from the gigantic animal we recognize today.

  • Three-horned face: skull anatomy

    Triceratops: The Mystery of Its Horns and Frill

    **Late Cretaceous North America, approximately 68–66 million years ago. Across river plains and woodlands walked a giant herbivore with two long brow horns, a smaller nose horn, and a spectacular bony shield-like structure behind its head.**