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Yandusaurus

Say it: yen-doo-SORE-us
Name means: “Yandu lizard”1
Ate: PlantsBeaked plant-eatersMiddle Jurassic

Yandusaurus was a small, fast plant-eater that ran on two legs. It lived in China during the Middle Jurassic, about 168 to 162 million years ago. With big eyes and a beak, it was a speedy little dinosaur that could dodge bigger predators.21

Lived
171 to 168 million years ago4
Middle Jurassic
Fossils found in
Sichuan Province, China2
Food
Plants12
Length
3 to 3.8 m2
estimates vary; He estimated 3 m, Peng 3.2 m, Paul 3.8 m
Weight
140 kg2
Top speed
about 45 km/h (28 mph)
Running, estimate

When did it live?

Triassic
Jurassic
Cretaceous
252 million years ago20114566, the asteroid

How big was it?

How long was it?

Yandusaurus about 3.8 m longA dog about 1 mA bicycle about 1.8 mA car about 4.5 mAn elephant, the biggest land animal today about 6.5 m

How heavy was it?

as heavy as 5 big dogs
as long as 4 dogs nose to tailas long as 21 bananas end to endas heavy as 28 watermelons

How big was Yandusaurus compared to YOU?

Just maths in your browser. Nothing is saved or sent anywhere.

How fast was it?

cool stuff

Fun facts

1

Yandusaurus had large eyes, as shown by the curved jugal bone in its skull.2

2

Its teeth had a unique pattern of parallel vertical ridges, which Chinese researchers compared to the fingers of Buddha statues.2

3

The first Yandusaurus fossil was accidentally dug up by a composter machine near the Honghe dam in 1973.2

4

Yandusaurus had four toes on each foot and five fingers on each hand.2

5

The name Yandusaurus comes from Yandu, the ancient name for Zigong, which means 'salt capital' because the city was a center of salt mining.2

6

Scientists once thought Yandusaurus was a hypsilophodontid, but now they place it in a group called Neornithischia.23

AI-madeAI-made picture of Yandusaurus
An AI-made picture of how Yandusaurus 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 Yandusaurus

?How big was Yandusaurus?

About 3 to 3.8 metres long and weighed around 140 kilograms.2

?What did Yandusaurus eat?

It was a plant-eater, or herbivore, with teeth that had a unique pattern of parallel ridges for chewing plants.21

?When did Yandusaurus live?

It lived during the Middle Jurassic period, about 168 to 162 million years ago.21

?Where was Yandusaurus found?

Its fossils were found in Sichuan Province, China, in the Lower Shaximiao Formation.21

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For dino experts

Scientific name
Yandusaurus
Named by
He 19794
Group
Beaked plant-eaters
Family / clade
Neornithischia4
Classification
Ornithischia4
Age of the rocks
171 to 168 million years (Bajocian)4
Rock formations
Shaximiao4
Countries
China4
Fossil records
2 in the Paleobiology Database4
Discovery
Yandusaurus was named in 1979 by Chinese paleontologist He Xinlu. The first fossils were found in 1973 by workers using a composter machine near the Honghe dam in Sichuan, China.2
Still debated
Scientists are not sure exactly where Yandusaurus fits in the dinosaur family tree. It is currently placed in Neornithischia, but its exact relationships are still debated.23

Where the facts come from

  1. Yandusaurus (nhm.ac.uk)
  2. Yandusaurus (en.wikipedia.org)
  3. PBDB Taxon (paleobiodb.org)
  4. Yandusaurus in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

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More from the same group: Beaked plant-eaters

Also from the same time: Middle Jurassic

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