Fun Unquillosaurus Facts For Kids

Aashita Dhingra
Feb 29, 2024 By Aashita Dhingra
Originally Published on Sep 16, 2021
Edited by Katherine Cook
Fact-checked by Pradhanya Rao
To explore more about this dinosaur, read these Unquillosaurus facts.
Age: 3-18
Read time: 3.9 Min

The Unquillosaurus, pronounced as 'Un-kwil-lo-sor-us', is also known as Unquillosaurus ceibalii. The first fossil specimen was found in the Los Blanquitos Formation region at Arroyo-Morterito and it has since been recorded that this dinosaur inhabited present-day Argentina. Not a lot of information is available about this dinosaur, but it is believed that it used to inhabit terrestrial habitats. Reproduction of this dinosaur used to take place sexually where the females used to lay fertilized eggs after the male deposited sperm inside the female body.

As the fossil specimen consisted of only the left pubis, it is quite difficult to determine how this dinosaur looked and also it is difficult to determine the weight of this dinosaur. The average Unquillosaurus size is estimated to be around 6.6-9.8 ft (200-300 cm). There is not a lot of information about what this dinosaur used to eat, but the diet is predicted to be carnivorous. The name Unquillosaurus is known to mean Unquillo river lizard.

It is quite interesting to learn more about this dinosaur and if you are interested, read about Draconyx and Sauropelta too.

Unquillosaurus Interesting Facts

How do you pronounce 'Unquillosaurus'?

Unquillosaurus is pronounced as 'Un-kwil-lo-sor-us'.

What type of dinosaur was an Unquillosaurus?

The Unquillosaurus was known to be a maniraptoran type of dinosaur.

In which geological period did Unquillosaurus roam the earth?

This dinosaur lived in the Late Cretaceous period.

When did the Unquillosaurus become Extinct?

The exact time period of the extinction of this species is unknown.

Where did the Unquillosaurus live?

This dinosaur used to live in present-day Argentina.

What was the Unquillosaurus' habitat?

Not much information is available about this dinosaur species and its habitat, but it is believed that it used to inhabit terrestrial habitats.

Who did the Unquillosaurus live with?

It is unknown whether the Unquillosaurus was a solitary creature or whether this dinosaur used to live in groups.

How long did an Unquillosaurus live?

The exact lifespan is unknown, but it has been noted that Unquillosaurus lived 83.6-72.1 million years ago.

How did they reproduce?

Reproduction in all dinosaurs took place sexually where the females used to lay fertilized eggs after the male had deposited its sperm inside their bodies.

Unquillosaurus Fun Facts

What did Unquillosaurus look like?

Not a lot is known about the physical appearance and features of this as the fossil specimen consisted of only the left pubis. However, a Unquillosarus was a maniraptora, a group of avian and non-avian disnosaurs. These dinosaurs are known to have long arms and three-fingered hands. They also had a half moon-shaped bone in their wrist. Also, some maniraptoras had feathers.

Kids will love these Unquillosaurus dinosaur facts.
We've been unable to source an image of Unquillosaurus and have used an image of Saurornitholestes instead. If you are able to provide us with a royalty-free image of Unquillosaurus, we would be happy to credit you. Please contact us at

How many bones did an Unquillosaurus have?

The exact number of bones that Unquillosaurus dinosaurs had is not known. The only bone so far that has been discovered is the pubis.

How did they communicate?

Communication happened through visual and vocal cues through sounds, postures, and gestures.

How big were the Unquillosaurus?

The evaluated body length of this dinosaur is around 6.6-9.8 ft (200-300 cm).

How fast could an Unquillosaurus move?

The moving speed of this dinosaur species is not available.

How much did an Unquillosaurus weigh?

Based on the fossil specimen found, it is difficult to estimate the weight of this species and the weight is unknown.

What were the male and female names of the species?

Males and females of this species do not have any specific names.

What would you call a baby Unquillosaurus?

A baby Unquillosaurus can be referred to as a hatchling.

What did they eat?

Not a lot is known about the food of this dinosaur, but it is believed that the diet was carnivorous.

How aggressive were they?

Dinosaurs, in general, were considered to be quite aggressive and violent, but to exactly determine the aggressiveness of this species is difficult because only one bone has so far been discovered.

Did you know...

The Unquillosaurus is means 'Unquillo river lizard', derived from the Unquillo River.

The holotype was named PVL 3670-11. It was discovered in the Los Blanquitos Formation region at Arroyo-Morterito and the fossil only consisted of the left pubis.

This specimen was known to be re-studied in 2004 by Federico Agnolin and Fernando Novas.

It is believed that this dinosaur was classified under Carnosauria initially by Powell in 1986.

In 2004, Agnolin and Novas stated that Unquillosaurus belonged to Maniraptora.

Why are they called Unquillosaurus?

The generic name of this dinosaur, Unquillosaurus ceibalii was derived from the river Unquillo and the specific name was kept in reference to the town El Ceibal. A rough translation of the name is 'Unquillo river lizard'.

Who discovered the Unquillosaurus?

It is not known who discovered this fossil specimen, but it was described by Jaime Eduardo Powell.

Here at Kidadl, we have carefully created lots of interesting family-friendly dinosaur facts for everyone to discover! Learn more about some other creatures from our Epidendrosaurus facts, or Scansoriopteryx facts for kids.

You can even occupy yourself at home by coloring in one of our free printable Unquillosaurus coloring pages.

Main image by James St. John 

Second image by Lewis Kelly

Unquillosaurus Facts

What Did They Prey On?


what Type of Animal were they?


Average Litter Size?


What Did They Look Like?


How Much Did They Weigh?


Skin Type

Dry scales

How Long Were They?

6.6-9.8 ft (200-300 cm)

How Tall Were They?










Scientific Name

Unquillosaurus ceibalii

What Were Their Main Threats?


What Habitat Did They Live In?

Terrestrial habitats

Where Did They Live?

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Written by Aashita Dhingra

Bachelors in Business Administration

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Aashita DhingraBachelors in Business Administration

Based in Lucknow, India, Aashita is a skilled content creator with experience crafting study guides for high school-aged kids. Her education includes a degree in Business Administration from St. Mary's Convent Inter College, which she leverages to bring a unique perspective to her work. Aashita's passion for writing and education is evident in her ability to craft engaging content.

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