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Shrinking evolution turned T. Rex into Tweety

WASHINGTON -- A branch of large, lumbering dinosaurs shrank over just 50 million years of evolution to become today's modern birds, a study showed Thursday.

“Birds out-shrank and out-evolved their dinosaurian ancestors, surviving where their larger, less evolvable relatives could not,” said lead author Michael Lee, a professor at the University of Adelaide's School of Earth and Environmental Sciences.

The bipedal, carnivorous dinosaurs dubbed theropods — a category that included Tyrannosaurus Rex and Velociraptor — were the only branch of dinosaurs to keep getting smaller and smaller, researchers said.

“Being smaller and lighter in the land of giants, with rapidly evolving anatomical adaptations, provided these bird ancestors with new ecological opportunities, such as the ability to climb trees, glide and fly,” he explained.

“Ultimately, this evolutionary flexibility helped birds survive the deadly meteorite impact which killed off all their dinosaurian cousins.”

These bird ancestors developed new adaptations, like feathers and wings, as much as four times more rapidly than other dinosaurs, said co-author Darren Naish, a paleontologist at Britain's University of Southampton.

The study examined more than 1,500 anatomical traits of dinosaurs as a way to reconstruct an evolutionary family tree.

The researchers used sophisticated mathematical models to trace the evolution of the adaptations and the changing size of the dinosaur group.

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This illustration image by Brian Choo, obtained Thursday, July 31 courtesy of the University of Southhampton, shows the feathered dinosaur Microraptor as it pounces on a nest of ...

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