Mammals’ complex spines are linked to high metabolisms; we’re learning how they evolved

Mammals’ backbones are weird. They’re much more complex than the spines of other land animals like reptiles. Scientists wanted to find out how these complex backbones evolved in the first place. They discovered that the process was marked by big, dramatic evolutionary changes, and that it’s linked to mammals being active animals with high metabolisms.
Paleontology News — ScienceDaily

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