Dino card No. 0419 of 2,027

Chucarosaurus

Say it: choo-kah-roh-SORE-us

Name means: “hard and indomitable animal lizard”1

Ate: PlantsLong-necksEarly Cretaceous

Chucarosaurus was a giant, long-necked plant-eater that lived in what is now Argentina. It was one of the biggest dinosaurs ever, with a thigh bone as long as a car!1

Lived

110 to 106 million years ago4

Early Cretaceous

Fossils found in

Violante farm, Rio Negro Province, Patagonia, Argentina4

Food

Plants4

Length

30 m2

estimate

Weight

50 tonnes2

estimate

When did it live?

Triassic

Jurassic

Cretaceous

252 million years ago20114566, the asteroid

How big was it?

How long was it?

How heavy was it?

as heavy as 8 elephants

as long as 7 cars parked in a rowas long as 170 bananas end to endas heavy as 10000 watermelons

How big was Chucarosaurus compared to YOU?

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cool stuff

Fun facts

Chucarosaurus belonged to a group of giant titanosaurs called Colossosauria, which includes some of the heaviest land animals ever.1

Its thigh bone (femur) was about 1.9 meters (6.2 feet) long, showing it was a truly massive dinosaur.1

The name Chucarosaurus comes from a Quechua word meaning 'hard and indomitable animal,' like a wild horse.1

Its arms and legs were surprisingly slender for such a huge dinosaur, which is unusual among giant titanosaurs.1

Chucarosaurus lived about 100 million years ago, during the middle of the Cretaceous Period.4

Only a few limb bones have been found, so scientists are still learning about this dinosaur.1

AI-made picture of Chucarosaurus — An AI-made picture of how Chucarosaurus might have looked, made by a computer from what scientists know. It is a guess: the real animal may have looked different, and nobody knows its true colours.

you asked

Most asked questions about Chucarosaurus

?How big was Chucarosaurus?

It was about 30 metres long and weighed around 50 tonnes, making it one of the biggest dinosaurs ever.2

?What did Chucarosaurus eat?

It was a plant-eater, like all sauropod dinosaurs.2

?When did Chucarosaurus live?

It lived about 100 million years ago, during the Early Cretaceous Period.3

?Was Chucarosaurus bigger than T. rex?

Yes, it was much bigger. Chucarosaurus was about 30 metres long and weighed 50 tonnes, while T. rex was about 12 metres long and weighed around 8 tonnes.2

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For dino experts

Scientific name: Chucarosaurus
Named by: Agnolin et al. 20234
Group: Long-necks
Family / clade: Colossosauria4
Classification: Sauropodomorpha > Sauropoda > Titanosauria > Macronaria4
Age of the rocks: 110 to 106 million years (Albian)4
Rock formations: Huincul4
Countries: Argentina4
Fossil records: 1 in the Paleobiology Database4
Discovery: Chucarosaurus was named in 2023 by Federico Agnolin and colleagues. The fossils were found at Violante farm in Rio Negro Province, Argentina.4
Still debated: Scientists are not sure exactly how big Chucarosaurus was, because only a few bones have been found.1

Where the facts come from

A new giant titanosaur (Dinosauria, Sauropoda) from the Upper Cretaceous of Northwestern Patagonia, Argentina (sciencedirect.com)
Long-necked dinosaur fossil found by Argentine scientists is one of biggest ever | Reuters (reuters.com)
Chucarosaurus (en.wikipedia.org)
Chucarosaurus in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

Every fact on this page has a number that points to its source. If we got something wrong, sorry, we are dino fans, not a science journal. Tell us at [email protected] and we will fix it.

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