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Birds got smart by becoming big babes

Out of the skulls of babes. Modern birds have skulls that look remarkably like those of juvenile dinosaurs, offering an unusual explanation for how birds came to have relatively large brains.

As dinosaurs evolved into birds, something arrested their development. The juvenile heads they kept may be responsible for their relatively high intelligence, and their incredible evolutionary success.

Birds are living dinosaurs, having evolved from feathered dinosaurs similar to the Velociraptor. They were the only dinosaurs to survive the mass extinction that took place 65 million years ago.

Bhart-Anjan Bhullar of Harvard University and colleagues took photos and CT scans of skulls belonging to juvenile and adult dinosaurs, extinct and modern birds, and more distant relatives like crocodiles.

They found that compared to their ancestors, birds' faces became flattened, and their brain cases relatively larger. That's exactly what young dinosaurs' skulls looked like.

"This could be a landmark study," says Gregory Erickson of the Florida State University in Tallahassee. "When you look at a bird you're looking at a young dinosaur."

Like bird like human

This switch to a more juvenile skull shape was also an important force in human evolution. Adult human skulls look much like those of baby chimpanzees, with flattened faces and over-sized brain cases.

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TAGGED: BIOLOGY, EVOLUTION


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