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Spinosaurus is the longest known terrestrial carnivore; other large carnivores comparable to Spinosaurus include theropods such as Tyrannosaurus, Giganotosaurus and the coeval Carcharodontosaurus. The most recent study suggests that previous body size estimates are overestimated, and that S. aegyptiacus reached 14 m (46 ft) in length and 7.4 t ...
Juvenile spinosaurid fossils are somewhat rare. However, an ungual phalanx measuring 21 mm (0.83 in) belonging to a very young Spinosaurus indicates that Spinosaurus, and probably by extent other spinosaurids, may have developed their semiaquatic adaptations at birth or at a very young age and maintained the adaptations throughout their lives ...
Iberospinus (meaning "Iberian spine") is an extinct genus of spinosaurid dinosaur from the Early Cretaceous Papo Seco Formation of Portugal.The genus contains a single species, I. natarioi, known from several assorted bones belonging to one individual.
The fossil provides a rare glimpse into a time of global environmental changes and faunal turnover, when some species go extinct while new ones are introduced due to varying changes in the habitat ...
Suchomimus itself was more adapted to a life hunting in shallow water due to its hollow bones, while Baryonyx and Spinosaurus were capable of fully submerging underwater and diving after prey. Courtesy of denser bones, the latter two spinosaurids could hunt underwater for prey and occupy a more derived lifestyle than Suchomimus could.
The only major group of terrestrial lizards to go extinct at the end of the Cretaceous were the polyglyphanodontians, a diverse group of mainly herbivorous lizards known predominantly from the Northern Hemisphere. [109] The mosasaurs, a diverse group of large predatory marine reptiles, also became extinct. Fossil evidence indicates that ...
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The BBC notes, "of the 41 communities researchers studied, arapaima populations were extinct in eight of them." And the giant fish, which typically weighs in at more than 400 pounds, is rapidly ...