Bigger Than We Thought . A recent analysis has shown that Alamosaurus may have been a bigger dinosaur than originally estimated, possibly in the weight class of its more famous South American cousin Argentinosaurus.It turns out that some of the "type fossils" used to reconstruct Alamosaurus may have come from adolescents rather than full-grown adults, meaning that this titanosaur may well have of one very big extinct animal, Tyrannosaurus rex. The most famous of the upright, largely meat-eating dinosaurs called theropods, T. rex would have weighed between 5,000 and 7,000 kilograms (11,000 to 15,500 pounds) with skin and flesh on its huge bones. That's about as much as the largest African elephant. By. Bob Strauss. Updated on April 25, 2019. Not only was Megalodon the biggest prehistoric shark that ever lived; it was the largest marine predator in the history of the planet, vastly outweighing both the modern Great White Shark and ancient reptiles like Liopleurodon and Kronosaurus. Below you'll find 10 fascinating facts about Megalodon. 01. It's believed to be one of the biggest land animals to have roamed the Earth. Fossils of A. louisae (the largest known Apatosaurus species) suggest the dinosaur reached 68.9 to 74.8 feet (21 to 22 megalodon size. Studies estimate that the body mass of adult megalodons (Carcharocles megalodon) ranged from roughly 30,000 kg (about 66,000 pounds) to more than 65,000 kg (about 143,000 pounds), adult females being larger (in both length and mass) than adult males. In contrast, most white sharks (Carcharodon carcharias) weigh between 680 and Apatosaurus or ' Brontosaurus ' was another giant sauropod that lived around the same time as Brachiosaurus between 155.7 to 150.8 million years ago, during the Jurassic Period. Palaeontologists believe that Apatosaurus ('Brontosaurus') reached lengths of 70-75ft in length which is around 21-23 meters, so certainly not a small dinosaur. .

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