Hollow bones in giant dinosaurs and pterosaurs show convergent evolution in action, fossil study suggests –

The herrerasaurid Gnathovorax cabreirai, whose fossilized remains researchers analyzed alongside two  sauropodomorph dinosaurs, showed no traces of air sacs. (Image credit: Márcio Castro; (CC BY-NC-ND 2.0))

Air sacs sandwiched inside the bones of the largest dinosaurs and pterosaurs to roam the Earth were so advantageous that these pockets might have evolved independently at least three times in different lineages, a new study finds.

Researchers already knew that these ancient giants had air bubbles in their bones. Now, evidence that some of the earliest dinosaurs on record lacked these air sacs suggests that they sprouted later, through convergent evolution, a phenomenon in which different organisms independently evolve similar traits.

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