Identifying the largest dinosaurs ever lived isn’t an easy task, because it’s very rare to unearth a complete fossil. Furthermore, only a tiny percentage of these amazing animals ever fossilized, and most of these “lucky” bodies will remain buried underground forever. So, we may never know exactly what dinosaur was the biggest (or the tiniest) ever.

Despite this fact, size always has been one of the most interesting aspects of these prehistoric animals. There are extreme variations in their size, from the tiny hummingbirds, which can weigh as little as three grams, to the titanosaurs, which could weigh as much as 70 tonnes, or even more.

Here are the largest dinosaurs ever lived.

Largest dinosaurs scale
Scale diagram of the largest known dinosaurs (length and mass) of five major clades: Sauropoda (Argentinosaurus huinculensis), Ornithopoda (Shantungosaurus giganteus), Theropoda (Spinosaurus aegyptiacus), Thyreophora (Stegosaurus ungulatus) and Marginocephalia (Triceratops prorsus). Compared in size with a human. Each grid section represents 1 square meter. Image: wikipedia

Biggest Dinosaur Ever: Patagotitan mayorum

The largest dinosaur ever lived: Patagotitan mayorum reconstruction
The largest dinosaur ever lived: Patagotitan mayorum reconstruction
Largest dinosaurs: Patagotitan mayorum vs human size comparison
The largest dinosaur ever lived: Patagotitan mayorum vs human size comparison

A new study published on August 8, 2017, in the journal Proceedings of the Royal Society B. proclaimed a newly named species the heavyweight champion of all dinosaurs: Patagotitan mayorum. It was named after Patagonia region where it was found, and the Greek word “titan”. Six fossils of the species were studied. The dinosaur averaged 122 feet (37 meters) long and was nearly 20 feet (6 meters) high at the shoulder. Based on ash found around them, the fossils were dated to about 100 million years ago.

Previously, another titanosaur called Argentinosaurus was previously thought to be the largest (see below).

According to Kristi Curry Rodgers, a paleontologist at Macalester College who wasn’t part of the study, Patagotitan’s bones show signs that they haven’t completed their growth “means that there are even bigger dinosaurs out there to discover”.

This Is the Biggest Dinosaur Ever Found | National Geographic
Meet Patagotitan mayorum, the biggest dinosaur ever discovered.
This is the biggest dinosaur ever discovered, which also means it’s the biggest land animal that’s ever lived. Its name: Patagotitan mayorum. Patagotitan may have been as large as any land animal could possibly get, weighing as much as 12 elephants. It belongs to a group of dinosaurs known as Titanosaurs, which include other enormous long-necked species. Scientists are studying its very complete skeleton found in Argentina’s Patagonia region. The quality of the remains allows for a detailed study of how such a huge body works.

Biggest Herbivorous Dinosaur: Argentinosaurus huinculensis

Previously, Argentinosaurus huinculensis (meaning “Argentine lizard”) was thought to be the largest, longest, and heaviest dinosaur ever lived. It is a genus of titanosaur sauropod dinosaur first discovered in Argentina (hence it is named Argentinosaurus). It lived on the then-island continent of South America somewhere between 94 and 97 million years ago, during the Late Cretaceous Epoch.

Its size was first estimated like: up to 39.7 meters (130 ft) in length, 7.3 meters (24 ft) in height, 80–100 tonnes (88–110 short tons) in weight. More recently, the weight estimate has been revised to 73 tons. Its maximum length also revised to 35 meters (115 feet). Scott Hartman, who known for his skeletal reconstructions (he has supplied skeletal and life reconstructions for numerous books and museums) suggests that since Argentinosaurus would have a shorter tail and narrower chest than Puertasaurus (another titanosaurian sauropod), suggesting that it was slightly smaller than other giant titanosaurs.

Studies show that an Argentinosaurus do not stop growing their entire lives. One article found that Argentinosaurus hatchlings would have had to grow 25,000 times their original size before reaching adult size.

Biggest Dinosaur Ever! Argentinosaurus | Planet Dinosaur | BBC
John Hurt narrates the facts behind the discovery of huge nesting site in modern day Patagonia. Fossilised remains show Argentinosaurus laid tens of thousands of eggs in a 15 km nesting site used for hundreds of thousands of years. The hatchlings, if they survive, will grow at an incredible rate. Over a 40 year life span Argentinosaurus can grow from 4 kg to 75 tons!
Narrated by John Hurt Planet Dinosaur tells the stories of the biggest, deadliest and weirdest creatures ever to walk the Earth, using the latest fossil evidence and immersive computer graphics.
Largest dinosaurs: Argentinosaurus huinculensis reconstruction
Argentinosaurus huinculensis reconstruction at Museo Municipal Carmen Funes, Plaza Huincul, Neuquén, Argentina. Photo: wikipedia
Largest dinosaurs: The Longest dinosaurs
Largest dinosaurs ever lived: The sauropods were the largest and heaviest dinosaurs. For much of the dinosaur era, the smallest sauropods were larger than anything else in their habitat. This scaled chart compares the sizes of several of the longest known dinosaurs against a 1.8-meter tall human. Argentinosaurus huinculensis, Mamenchisaurus sinocanadorum, Supersaurus vivianae, Diplodocus hallorum, and Futalognkosaurus dukei. Image: Wikipedia

Largest Carnivorous Dinosaur: Spinosaurus aegyptiacus

This terrifying giant was the largest, longest and heaviest carnivorous ever lived. Spinosaurus (meaning “spine lizard”) is a genus of theropod dinosaur that lived in what now is North Africa, during the lower Albian to lower Cenomanian stages of the Cretaceous period, about 112 to 97 million years ago.

Since its discovery, Spinosaurus has been a contender for the longest and largest theropod dinosaur. Its size is estimated up to 16 to 18 meters (52 to 59 ft) in length and 11.7 to 16.7 tonnes (12.9 to 18.4 short tons) in weight.

Some experts insist that the biggest meat-eater was the South American Giganotosaurus, which may have matched, and occasionally even outclassed, its northern African cousin.

Spinosaurus vs Carcharodontosaurus | The balance of power | Planet Dinosaur | BBC
Spinosaurus comes across Carcharodontosaurus feeding on a carcass. A dangerous fight is inevitable. Spinosaurus has size and strength on his side, but Carcharodontosaurus has the more lethal bite. Planet Dinosaur tells the stories of the biggest, deadliest and weirdest creatures ever to walk the Earth, using the latest fossil evidence and immersive computer graphics. Narrated by John Hurt.
Largest dinosaurs: Spinosaurus skeleton
Reconstructed Spinosaurus skeleton in swimming posture at the National Geographic Museum. Photo: Wikipedia
Largest dinosaurs: Spinosaurus, Tierpark-Germendorf
A Spinosaurus sculpture in Germany (Tierpark Germendorf, a leisure park with animal enclosures & full-size dinosaur models), reflecting how the animal was depicted prior to 2014. Photo: Wikipedia

What about T. Rex?

Tyrannosaurus Rex once widely considered (and often assumed) to be the world’s biggest carnivorous dinosaur, but not anymore. It is still among the largest known land predators and may have exerted one of the largest biting forces among all animals: a 2012 study by scientists Karl Bates and Peter Falkingham suggested that the bite force of Tyrannosaurus could have been the strongest of any terrestrial animal that has ever lived.

The calculations suggested that adult T. rex could have generated from 35,000 to 57,000 Newtons of force in the back teeth. Even higher estimates were made by professor Mason B. Meers of the University of Tampa in 2003. In his study, Meers estimated a possible bite force of around 183,000 to 235,000 Newtons or 18.3 to 23.5 metric tons (20.2 to 25.9 short tons).

But in size, it has been surpassed in the rankings by Spinosaurus and Giganotosaurus. The largest complete specimen, located at the Field Museum of Natural History under the name FMNH PR2081 and nicknamed Sue, measured 12.3 meters (40 ft) long, and was 4 meters (13 ft) tall at the hips. Mass estimates have varied widely over the years, from more than 7.2 metric tons (7.9 short tons), to less than 4.5 metric tons (5.0 short tons), with most modern estimates ranging between 5.4 metric tons (6.0 short tons) and 6.8 metric tons (7.5 short tons).

Largest dinosaurs ever lived: Sue the T-Rex
“Sue” is the nickname given to FMNH PR 2081, which is the largest, most extensive and best-preserved Tyrannosaurus rex specimen ever found. It has a length of 12.3 meters (40 ft), stands 4 meters (13 ft) tall at the hips, and was estimated to have weighed more than 6.4 metric tons when alive. It was discovered in the summer of 1990 by Sue Hendrickson, a paleontologist, and was named after her. After ownership disputes were settled, the fossil was auctioned in October 1997 for $7.6 million, the highest amount ever paid for a dinosaur fossil, and is now a permanent feature at the Field Museum of Natural History in Chicago, Illinois. Photo: Wikipedia
Largest theropods
Largest dinosaurs ever lived: Size comparison of selected giant theropod dinosaurs and a human. Spinosaurus aegyptiacus, Carcharodontosaurus saharicus, Giganotosaurus carolinii, and Tyrannosaurus rex (FMNH PR2081, nicknamed Sue). Image: Wikipedia

How did dinosaurs get that big?

How did these amazing animals get that big? The video published by PBS Eons channel gives some answers to that question.

Part of why we’re so fascinated with extinct dinosaurs it’s just hard for us to believe that animals that huge actually existed. And yet, they existed! From the Jurassic to the Cretaceous Periods, creatures as tall as a five-story building were shaking the Earth. So, how did dinosaurs get so huge?


M. Özgür Nevres
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