The biggest dinosaurs that lived on Earth

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Spinosaurus

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The spinosaurus is the biggest carnivorous dinosaur to ever live. It lived in what is now know as North-Africa, in the early stages of the Cenomanian stages of the Cretaceous Period.
Most of you guys on this forum that knows a bit about dinosaurs knows that the first speciment of spinosaurus was found by Ernst Stromer in 1915 in Egypt. He found a lower jaw, teeth, several pieces of its erected spine, ribs, vertebrae and a single phalanx. But what Stromer found was all destroyed during WW2, when the museum it was in was bombed, and all evidence, and the only evidence of Spinos was destroyed. 
Stromer estimated the Spinosaurus to be around 12 meters long. But newer discoveries from 1999, 2005 and 2014 suggest evidence that may have reached lengths of 18 meters. Dr. Dal Sasso even suggested that Spino reached lengths of 20 meters, which would be an astonishing lentgh. 
The biggest individual ever was also found be Dr. Dal Sasso. He found a mere complete upperjaw that had a length of 2 meters! 

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Here is a plaque that shows the two first, and the two biggest individuals ever found of both T-Rex and Spinos. And what scientists belive is their weight. 

Regarding their wheight it`s really hard to say really how big they were. Some scientists suggest 7 tonnes, some suggest 22 tonnes. But my estimations is that the Largest individuals ranged from 8-12,5 tonnes. Size has been really hard to tell in the past 10 years because of lack of evidence on the dinosaur alone. But now I see a clearer image of the spinos size, and how it lived. 

Before the newest discovery in 2014 we thought that Spinos lived like most other carnivorous dinosaurs, but the new evidence acctually shows that they lived a large portion of their lives in water. And is one of very few semi-aquatic dinosaurs. Evidence also shows that it was a notorius fisheater, the last land living piscivoreous dinosaur to ever live. Its thought that they manily preyed upon sawfish, which looks exactly the same as the modern sawfish, but it grew to 8 meters in length. They have found several of the sawspines of sawfish inbeded in the teeth spinos. Like crocodilians they have small pits in their snouts, these pits are connected to very sensitiv nerves that are connected to the brain, and that gives spinos a great advantage when fishing. These pits can sense any movement in the water, so spinos don`t even have to see the fish to kill it. 
Its also thought that spinos, in the tougher periods of the year, when water and fish was scares, could prey on flying dinosaurs, because they have found several evidence of this in the spinos closest cousins in South-America and Asia, where they have found teeth of spinos inprintet in the bones of flying dinosaurs. They are also thought to prey on Ouranosaurus, but this is a less likely prey, since Spinos most likely was slow, and also walked on four legs most of the time. They really didn`t seem to be comfortable out of water. Its even thougth that they might have webbed feet. 

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It lived with a lot of other big carnivourus Dinosaurs, like Carcharodontosaurus and Rugops, and also giant Crocodiles. Its even belived that rugops, a giant dinosaur measuring 7-9 meters, even scavanged on the scraps of the successful Spino. It has been suggested that Spinos and Carcharodontosaurus were rivals, and they even have evidence of a battle between these two carnivores, where there have been found the tooth of a Carcharodontosaurus inbeded in the elongated spine of the Spino. And as far a the crocodiles go, the Spino obviously lived in water, so I don`t think Crocodiles posed as any kind of threat, or danger towards spinos. 

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Spino vs Giant Croc art

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Spino and a rugops in the background

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Spino and a Carcharodontosaurus fight over a Ouranosaurus
 

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