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Getting Small the Key for Dinos that Became Birds

The dinosaur lineage that evolved into birds shrank in body size continuously for 50 million years. From left to right are: the ancestral neotheropod (~220 Million years old), the ancestral tetanuran (~200 million years old), the ancestral coelurosaur (~175 million years old), the ancestral paravian (~165 million years old), and Archaeopteryx (150 million years old). Leer más.

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