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The ornamental cranial structures—especially the nasal horn and the frill spines—would have had multiple functions
con un pico córneo y una característica gola en la parte posterior de su cabeza
Fossils of Psittacosaurus sibiricus have been found in the Shestakovo Formation in Siberia
partially protected by osteoderms and adapted to feeding on low vegetation in an environment where armoured dinosaurs were much rarer than in the fossil records of the Northern Hemisphere
Achillobator giganticus Variante:Imprimado The ornamental cranial structures—especially theAchillobator giganticus fue un gran dinosaurio terpodo dromeosurido del Cretcico Superior de Mongolia, conocido a partir de restos procedentes de la Formacin Bayan Shireh, en la regin de Burkhant. Descrito formalmente en 1999, este taxn representa uno de los dromeosuridos de mayor tamao conocidos y uno de los grandes depredadores manirraptores de los ecosistemas asiticos del Cretcico tardo. Su nombre combina una referencia a Aquiles, el hroe de la
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