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Study traces dinosaur evolution into early birds

1:16 PM 0

WASHINGTON - Scientists have mapped how a group of fearsome, massive dinosaurs evolved and shrank to the likes of robins and hummingbirds.

Comparing fossils of 120 different species and 1,500 skeletal features, especially thigh bones, researchers constructed a detailed family tree ......

This undated artist rendering provided by the journal Science shows the dinosaur lineage which evolved into birds shrank in body size continuously for 50 million years. From left are, the ancestral neotheropod, the ancestral tetanuran, the ancestral coelurosaur, the ancestral paravian and Archaeopteryx. Scientists have mapped how one group of dinosaurs evolved from the likes of the fearsome Tyrannosaurus rex and primitive Herrerasaurus to the welcome robin and cute hummingbird. The surprisingly steady shrinking and elegant evolution of some Triassic dinosaurs is detailed in the journal Science on Thursday. Comparing fossils of 120 different species and 1,500 skeletal features, especially leg bones, researchers constructed a detailed family tree of theropod dinosaurs. That suborder of dinos survives to this day as birds, however unrecognizable and improbable it sounds. (AP Photo/Davide Bonnadonna, Science) Show/Hide caption

This undated artist rendering provided by the journal Science shows the dinosaur lineage which evolved into birds shrank in body size continuously for 50 million years. From left are, the ancestral neotheropod, the ancestral tetanuran, the ancestral coelurosaur, the ancestral paravian and Archaeopteryx. Scientists have mapped how one group of dinosaurs evolved from the likes of the fearsome Tyrannosaurus rex and primitive Herrerasaurus to the welcome robin and cute hummingbird. The surprisingly steady shrinking and elegant evolution of some Triassic dinosaurs is detailed in the journal Science on Thursday. Comparing fossils of 120 different species and 1,500 skeletal features, especially leg bones, researchers constructed a detailed family tree of theropod dinosaurs. That suborder of dinos survives to this day as birds, however unrecognizable and improbable it sounds. (AP Photo/Davide Bonnadonna, Science)

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