Evolution and Paleontology Studies

Paleontologists studying mammal evolution piece together how and why roughly 6,000 living species—and countless extinct ones—came to occupy such a remarkable range of body sizes, diets, and habitats over the past 200-plus million years. By combining fossil evidence with molecular phylogenies and statistical tools for comparing traits across evolutionary trees, researchers can estimate when lineages diverged, how fast they diversified, and which environmental shifts—such as the mass extinction at the end of the Cretaceous or the cooling climates of the Cenozoic—triggered bursts of adaptation. One pressing question is how reliably the fossil record captures the true tempo of speciation and extinction, since gaps in preservation can distort our picture of adaptive radiations like the explosive diversification of placental mammals. Researchers are also working to reconcile molecular clock estimates with stratigraphic data and to understand why some mammal groups radiated rapidly into new ecological roles while others remained species-poor for tens of millions of years.

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Keywords

Mammal EvolutionPhylogenetic Comparative AnalysisDiversification RatesAdaptive RadiationPaleobiologySpeciation and Extinction