HOW '' BIRD-STUDENTS '' CAME TO FLY : MASTER EVOLUTION ESSAY

Well-preserved fossil enlighten researchers on how dinosaurs got off the ground, on their way to becoming all those soaring, darting birds.

IN 1861, scientists discovered Archaeopteryx, a dinosaur with feathers, in 150-million-year-old limestones in Solnhofen, Germany.  

They didn't know it at the time, but that fossilized skeleton - and the several that followed - provided a key piece of evidence for the theory of evolution, as well as for the fact that birds were actually dinosaurs.

Since then, researchers have pored over every detail of available specimens, trying to puzzle out how birds came to fly.

SO YOU MIGHT EXPECT that such a well-studied fossil species wouldn't be capable of surprises.  

But in a new paper, a team led by Jingmai O' Connor, a paleontologist at the Field Museum in Chicago, revealed previously unrecorded soft tissues and skeletal details from a new specimen, known as Chicago Archaeopteryx. 

What they found also helps explain why some feathered dinosaurs got off the ground, if only for short-haul flights.

MANY ARCHAEOPTERYX specimens are too flattened by geology to discern important skeletal details. The latest specimen, acquired by the Field Museum in 2022, led by Dr. O'Connor's team address some of the anatomical uncertainties.

Unlike other specimens, the bones of the Chicago Archaeopteryx were preserved in three dimensions, allowing the researchers to better evaluate the skull's palate.

That showed the earliest signs of an evolutionary trajectory towards the skulls of modern birds.

In another accident of fossilization, the carcass's wings were separated from the body, leaving them '' precisely preserved. ''

The team confirmed that rather than having two layers of wing feathers, Archaeopteryx actually had three.

In modern birds, that third layer helps link the shorter forearm to the body to create a continuous lift surface, which allows for sustained flight.

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