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Herrerasaurus
Photo: Herrerasaurus dinosaur in the woods
WALLPAPER
An artist's depiction shows a Herrerasaurus lurking in a forest in what is now Argentina as smaller animals hide in the undergrowth. Herrerasaur fossils are among the oldest ever discovered, dating back about 228 million years to the mid-Triassic.
Artwork by John Gurche

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