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  4. Whales vs. Dinosaurs: What’s the Biggest Animal of All Time?
  5. Whales or dinosaurs: What are the biggest, heaviest, longest animals ever?

Its bones were first found in the Jurassic rock of Dry Mesa, Colorado in Sadly, it loses out to its competitors when it comes to weight. But the remains were paltry, and what's more, their whereabouts are currently unknown, making it impossible to verify the original dimensions.

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Palaeontologists will have to find another one in order to find out. Like many of the giants on this list, this one has a troubled history. But as was the case with many of the biggest dinos, this estimate was made by sizing up more complete skeletons to the scale of the partial Seismosaurus remains — and some errors inevitably snuck in. Since its announcement, the dinosaur originally called Seismosaurus has been downsized to about feet 34 metres , and is now recognised as a species of Diplodocus.

Argentinosaurus huinculensis. Argentinosaurus was a favourite in the size race for a while — and, ironically, that's because not very much of the giant has yet been found.

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The known remains for this dinosaur include only a few vertebrae from the neck and back, ribs and two partial leg bones. To be sure, the bones are massive, but we don't really know precisely how massive.

Found in the Cretaceous rock of Argentina, Futalognkosaurus is probably one of the best-known dinosaur giants. Top header image with modifications : Phil Dokas , Flickr.


Brian Switek is a freelance science writer and amateur palaeontologist based out of Salt Lake City, Utah. Follow him Laelaps. Our planet is a busy, crazy place. And amidst all the noise, voices get lost and some stories are never heard.

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It's unclear just how large Brachiosaurus really was because most size estimates for the dinosaur come from fossils of what was thought to be its African form, B.

But in a study in the Journal of Vertebrate Paleontology , paleontologist Michael Taylor reanalyzed the fossils of B. Taylor later estimated that B. Additionally, Brachiosaurus may have weighed about 62 tons 56 metric tons , according to study in the journal PLOS Biology. At the time of its discovery in , Brachiosaurus was declared the largest dinosaur ever, but other sauropods are now believed to have been bigger and heavier than Brachiosaurus.

Whales vs. Dinosaurs: What’s the Biggest Animal of All Time?

Paleontologists once believed that Brachiosaurus lived mostly in the water, due partly to its nostrils being at the top of its egg-shaped head. But this likely was not the case for several reasons. For one thing, sauropods had air-filled pockets inside their bodies, which would have made them quite buoyant and unstable if they entered deep water, according to a study in the journal Biology Letters.

Instead, Brachiosaurus and other sauropods stuck to land, and probably even preferred flat land due to the high energetic cost of climbing hills with their incredibly large bodies, according to a study in the Journal of Theoretical Biology. Unlike most other other sauropods, Brachiosaurus had long forelimbs that caused its back to incline.

If its neck exited its body in a fairly straight line, as is currently believed, this would have resulted in it pointing upwards, though the exact angle and flexibility of its neck continues to be debated. The dinosaur's skull had a wide muzzle and thick jawbones that housed spoon-shaped teeth, which were perfectly suited for stripping vegetation.

Brachiosaurus probably fed on coniferous trees, gingkoes and cycads.

Whales or dinosaurs: What are the biggest, heaviest, longest animals ever?

Adult sauropods, including Brachiosaurus , likely had to eat up to kilograms pounds of dry plant matter every day, according to a study in the Proceeding of the Royal Society B. Scientists believe that Brachiosaurus swallowed vegetation whole, as its teeth were suited to stripping vegetation but not breaking up large chunks of plants.

Brachiosaurus are thought to have traveled in herds, moving on after they had exhausted the vegetation in a particular area. While it is believed that they stripped trees of their vegetation "high browsing" , it is likely that they supplemented their diets with vegetation at lower levels "low browsing" , especially as the food supply dwindled. In , Wilkinson and his colleague Graeme Ruxton sought to determine if low browsing was an energetically attractive option for sauropods, as it would have allowed them to feed on a larger swath of food without needing to move their whole body to a new area.

However, this doesn't necessarily mean the dinosaurs were dedicated to low browsing instead of or in addition to high browsing. Unlike its portrayal in the movie "Jurassic Park," paleontologists do not believe that Brachiosaurus could rear up on its hind legs.