Dinosaurs, a diverse group of more than a thousand reptilian species, dominated our planet for 180 million years.17 As a matter of comparison, we Homo sapiens have been around for less than 0.2 million years. Dinosaurs couldn’t have survived and thrived for so long unless they were highly robust and adaptable. Molecular evidence has shown that many modern mammalian orders—Carnivora, Primata, Proboscidea—coexisted with dinosaurs for at least 30 million years during the Cretaceous period (145 to 66 million years ago), and maybe even earlier. The mammals during the era of dinosaurs were small,
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