Question 1

How do you say Argentinosaurus?

Accepted Answer

Argentinosaurus is pronounced ar-JEN-tee-no-SORE-us. Break it into four chunks: ar, then JEN, then no, then SORE-us. The stress lands hardest on JEN and on SORE. Say it slowly a few times and it starts to feel natural pretty quickly. The Natural History Museum in London confirms this pronunciation.

Question 2

What does Argentinosaurus mean?

Accepted Answer

Argentinosaurus means 'Argentina lizard.' The first part of the name refers to Argentina, the South American country where the fossils were found. The second part, 'saurus,' comes from ancient Greek and simply means lizard. Argentina itself comes from the Latin word for silver, 'argentum,' so the name has a hidden meaning of 'silver lizard' buried inside it.

Question 3

How big was Argentinosaurus?

Accepted Answer

Argentinosaurus was absolutely enormous, measuring somewhere between 30 and 35 meters (98 to 115 feet) long. It weighed an estimated 65 to 80 tonnes, which is heavier than 10 fully grown African elephants combined. It is one of the largest land animals ever to have existed on Earth. To give you a sense of scale, a single one of its backbone bones was taller than most adult humans.

Question 4

Was Argentinosaurus the biggest dinosaur ever?

Accepted Answer

Argentinosaurus is one of the strongest candidates for the biggest dinosaur ever, but the honest answer is that scientists are not completely sure. Because so few bones have been found, size estimates have a wide margin of error. Another titanosaur from Argentina called Patagotitan mayorum, discovered in 2014, also competes for the title. The debate among paleontologists is genuinely ongoing and has not been settled.

Question 5

What did Argentinosaurus eat?

Accepted Answer

Argentinosaurus was a herbivore that ate tough plant material including leaves, branches, and conifer foliage. Its small peg-like teeth were designed for stripping vegetation from branches rather than chewing, so it swallowed plant material in large quantities and digested it in its enormous stomach. Scientists estimate it may have needed to eat hundreds of kilograms of plants every single day to fuel a body that massive.

Question 6

When did Argentinosaurus live?

Accepted Answer

Argentinosaurus lived approximately 89.8 million years ago during the Late Cretaceous period, specifically in an age called the Cenomanian-Turonian. That means it lived roughly 25 million years after some of the most famous Jurassic dinosaurs like Brachiosaurus. The Late Cretaceous was a period dominated by titanosaur sauropods in South America, and Argentinosaurus was the giant among giants.

Question 7

Where did Argentinosaurus live?

Accepted Answer

Argentinosaurus lived in what is now Patagonia in Argentina, South America. Specifically, its fossils were found near the town of Plaza Huincul in Neuquen Province. At the time it was alive, roughly 90 million years ago, this region was a warm environment with river floodplains, conifer forests, and open fern-covered areas, very different from the cool windswept Patagonia we know today.

Question 8

How was Argentinosaurus discovered?

Accepted Answer

Argentinosaurus was first found in 1987 by a local Argentine rancher named Guillermo Heredia on his property near Plaza Huincul. He initially thought the giant bone he found was a piece of petrified wood, which is easy to understand given how massive it was. Paleontologists investigated and recognized it as something extraordinary. The species was formally described and named in 1993 by Jose Bonaparte and Rodolfo Coria.

Question 9

Did anything hunt Argentinosaurus?

Accepted Answer

Adult Argentinosaurus were almost certainly too large for any known predator to successfully attack. However, juveniles were vulnerable, and they lived alongside Giganotosaurus and Mapusaurus, two of the largest meat-eating dinosaurs ever discovered. Some scientists have suggested that Mapusaurus may have hunted in groups specifically to take down young or sick titanosaurs like Argentinosaurus. Adults were likely safe simply because of their sheer size.

Question 10

How complete is the Argentinosaurus skeleton?

Accepted Answer

The Argentinosaurus skeleton is very incomplete, which is one reason scientists debate its exact size. Paleontologists have found a handful of dorsal vertebrae, a partial fibula, some rib fragments, and a few other bones. No skull has ever been found. All size estimates for this animal are extrapolations based on those limited remains compared to more complete relatives. It is remarkable that such fragmentary evidence points so clearly to an animal of record-breaking proportions.

Question 11

How fast could Argentinosaurus move?

Accepted Answer

Argentinosaurus was not built for speed. Scientists estimate that a sauropod of this size likely moved at a top speed of around 7 to 8 kilometers per hour (about 4 to 5 miles per hour), roughly a brisk human walking pace. Moving faster would have put enormous strain on its bones and joints. Speed was simply not a survival strategy for Argentinosaurus. At 80 tonnes, it had almost nothing to fear from predators once it reached adult size.

Question 12

Is Argentinosaurus related to Brachiosaurus?

Accepted Answer

Yes, Argentinosaurus and Brachiosaurus were both sauropod dinosaurs, but they were not closely related within that group. Brachiosaurus belonged to a group called Brachiosauridae and lived during the Jurassic period, roughly 150 million years ago. Argentinosaurus belonged to Titanosauria and lived during the Late Cretaceous, about 90 million years ago. They share the same general body plan, with long necks and four pillar-like legs, because both inherited it from common earlier sauropod ancestors.

Question 13

How did Argentinosaurus support its own weight?

Accepted Answer

Argentinosaurus had several adaptations to manage its colossal weight. Its vertebrae were hollow in places, reducing the weight of the spine without sacrificing strength, a trick also seen in birds today. Its four legs were thick and column-like, acting more like pillars than limbs, to bear the load. Scientists believe its skeleton was structured to distribute weight efficiently across all four legs at all times, which is why it could never have run or reared up on two legs like smaller sauropods sometimes did.

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