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Choyrodon

Say it: CHOY-roh-don

Name means: “Choyr tooth, named after the city of Choyr in Mongolia and the Latin word for tooth”1

Ate: PlantsBeaked plant-eatersEarly Cretaceous

Choyrodon was a plant-eating dinosaur that lived in Mongolia about 110 to 100 million years ago. It had a beak and lots of teeth for munching plants. It was a cousin of the famous duck-billed dinosaurs.1 2

Lived

110 to 100 million years ago5

Early Cretaceous

Fossils found in

Fossils were found in the Khuren Dukh Formation in southeastern Mongolia.3

Food

Plants2

Length

up to 6.2 m4

largest known specimen

Weight

up to 1 tonnes4

largest known specimen

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 33 big dogs

as long as 6 dogs nose to tailas long as 34 bananas end to endas heavy as 200 watermelons

How big was Choyrodon compared to YOU?

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cool stuff

Fun facts

Choyrodon had an open hole in its skull called an antorbital fenestra, which is a primitive feature, but it also had advanced features like a downturned jaw and a big nostril opening.3

The type specimen of Choyrodon was a subadult when it died, meaning it was not fully grown.3

Choyrodon lived in the same place and time as another plant-eating dinosaur called Altirhinus, but they were different species.3

Scientists think Choyrodon was closely related to a North American dinosaur called Eolambia.3

Choyrodon had a beak with a flattened bottom edge and a row of small holes along the side, which is unusual.3

The fossils of Choyrodon were found in rocks that are about 110 to 100 million years old, from the Albian age of the Early Cretaceous.2

AI-made picture of Choyrodon — An AI-made picture of how Choyrodon 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 Choyrodon

?Did Choyrodon have feathers?

No, scientists think Choyrodon did not have feathers. It was an ornithopod dinosaur with scaly skin like a lizard.1

?How big was Choyrodon?

Choyrodon was a medium sized dinosaur. Based on the fossils, it was about 4 metres long, roughly the size of a small car.3

?What did Choyrodon eat?

Choyrodon was a herbivore, meaning it ate plants like ferns, cycads and leaves. It used its beak to chop off bits of plants and its many teeth to grind them up.1 5

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For dino experts

Scientific name: Choyrodon
Named by: Gates et al. 20185
Group: Beaked plant-eaters
Family / clade: Iguanodontia5
Classification: Ornithischia > Ornithopoda > Iguanodontia5
Age of the rocks: 110 to 100 million years (Albian)5
Rock formations: Khuren Dukh5
Countries: Mongolia5
Fossil records: 2 in the Paleobiology Database5
Discovery: Three partial skeletons were found in Mongolia by an expedition led by Mongolian paleontologist Rinchen Barsbold. In 2018, American paleontologist Terry Gates and colleagues named the dinosaur Choyrodon barsboldi, honoring Barsbold.1 3
Still debated: Scientists are still debating exactly where Choyrodon fits in the dinosaur family tree, because it has a mix of primitive and advanced features.3

Where the facts come from

Choyrodon (en.wikipedia.org)
PBDB Taxon (paleobiodb.org)
A new iguanodontian (Dinosauria: Ornithopoda) from the Early Cretaceous of Mongolia (pmc.ncbi.nlm.nih.gov)
Choyrodon barsboldi | Dinosaur Database by DinoAnimals.com (dinoanimals.com)
Choyrodon 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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