Paleontology
Basically because dinosaurs ruled and evolved for approx 160 million years, whereas we have only evolved as humanoids for about 7-10 million years.
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Restoration of various Dimetrodon species to scale Dimetrodon meaning "two measures of teeth") is an extinct genus of synapsid that lived during the Early Permian period, around 295–272 million years ago (Ma).It is a member of the family Sphenacodontidae. The most prominent feature of Dimetrodon is the large sail on its back formed by elongated spines extending from the vertebrae. It walked on four legs and had a tall, curved skull with large teeth of different sizes set along the jaws
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