and they eventually became extinct

con su cabeza baja y sus ojos fijos en el río

allowing scientists to study its anatomy in detail

Polacanthus had a large and robust body

These giant arthropods inhabited the extensive humid forests that characterized the Earth during the Carboniferous period

Dilophosaurus Carnotaurus sastrei and they eventually became extinctDilophosaurus (D. wetherilli, "Two crested lizard") is a genus of coelophysid theropod dinosaur that lived during the Sinemurian and Pliensbachian Age of the Early Jurassic, approximately 193 to 183 million years ago. The Dilophosaurus was a medium sized bipedal predator, with a length of about 6 7 meters in length and a weight of around 400 kilograms, and the findings suggest that it could hunt in groups. Dilophosaurus had a distinctive skull with