Fun Dryosaurus Facts For Kids | Kidadl


Fun Dryosaurus Facts For Kids

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The Dryosaurus altus dinosaur is also known as tree lizard or oak lizard and was discovered by O. C. Marsh. The dinosaur fossil was first discovered in the late 19th century in the Western United States; and was subsequently fossils were also found in North America and Tanzania. It lived during the Late Jurassic period to the Early Cretaceous time range 156-145 million years ago. This bipedal dinosaur had a long neck, moderate to the small-sized skull, toothless upper jaw, short arms, and strong legs. Due to the lack of teeth in the upper jaw, it couldn't have hard or chewy food. It was a herbivorous dinosaur whose diet consisted of plants, leaves, conifers, and ginkgos. It could run very fast and was probably one of the fastest dinosaurs in the world.

If you like reading about Dryosaurus, also check out interesting dinosaur facts about Pukyongosaurus and Acanthopholis!

Fun Dryosaurus Facts For Kids

What did they prey on?

Plants, leaves, and fruits

What did they eat?


Average litter size?


How much did they weigh?

170-200 lb (77-90.7 kg)

How long were they?

24-36 in (60.96-91.44 cm)

How tall were they?

6 ft (1.83 m)

What did they look like?

Long neck and tail, horny beak, cheek teeth, and strong legs

Skin Type

Irregular, bumpy, scaly skin

What were their main threats?

Climate change, other predators, and dinosaurs

Where were they found?

Woodlands and forests


Western United States (Colorado, Utah, and Wyoming), North America, and Tanzania






Dinosauria and Ornithopoda



Scientific Name

Dryosaurus altus

How scary were they?


How loud were they?


How intelligent were they?


Dryosaurus Interesting Facts

How do you pronounce 'Dryosaurus '?

The tree lizard called Dryosaurus is pronounced as 'dry - oh - sawr - rus'.

What type of dinosaur was a Dryosaurus?

The Dryosaurus dinosaur or tree lizard is a bipedal herbivore that belongs to the Ornithopoda clade and Dryosauridae family.

In which geological period did the Dryosaurus roam the Earth?

The Dryosaurus altus lived on Earth during the Late Jurassic period ranging from 156-145 million years ago.

When did the Dryosaurus become extinct?

The Dryosaurus dinosaurs became extinct during the Late Cretaceous–Paleogene period mass extinction at the end of the Mesozoic Era around 66 million years ago when a large meteor or comet hit the earth.

Where did a Dryosaurus live?

Dryosaurus skeleton fossils were first discovered in the late 19th century by O. C. Marsh. They were found in Western United States (Colorado, Utah, and Wyoming), North America, and Tanzania.

What was a Dryosaurus's habitat?

The Dryosaurus lived in forest and woodland range with tall oak trees. The dinosaur got its name, oak lizard, from the habitat it lived in. It inhabited areas near water and with plenty of food.

Who did a Dryosaurus live with?

Dryosaurus or tree lizards are herding dinosaurs that formed herds of around 20-30 dinosaurs. Their herds were a mix of Dryosaurus adults, juveniles, and some similarly sized dinosaur species. They form groups with larger armored herbivores for protection from carnivorous predators.

How long did a Dryosaurus live?

Dryosaurus lived for an average of around 14 years. Like other dinosaurs, they could have had three basic life stages; juvenile, sub-adult, and adult.

How did they reproduce?

Dryosaurus reproduced by laying eggs. They were oviparous and the eggs were fertilized internally. Before mating, the males show their territory to the female and the female finally decides to stay in a place near water. They puff up their large cheeks with water during mating displays. Fossil of eggshells has also been found.

Dryosaurus Fun Facts 

What did a Dryosaurus look like?

Dryosaurus had large eyes which allowed it to see predators or danger from far. They were bipedal dinosaurs with thin, long legs with three toes and shorter arms with five fingers. It had a moderate-sized head with a horny beak, toothless upper jaw, and cheek teeth which may have helped the dinosaur store food in its cheeks. It had a slender, long neck and a stiff tail used for balance, especially when it ran. Dryosaurus teeth had a distinct ridge on its lateral surface were characterized by a strong median ridge on the lateral surface.

Dryosaurus skeleton fossils were first discovered in the late 19th century

How many bones did a Dryosaurus have?

The exact number of bones in a Dryosaurus is not known especially since an adult specimen has not been found yet. Many partial Dryosaurus skeleton fossils have been found ranging from embryonic to juvenile ages.

How did they communicate?

Like other dinosaurs, it can be assumed that the Dryosaurus dinosaur communicated using their bodies, slender limbs, cheeks, and vocalization. Dinosaurs can create distinct open-mouthed sounds and closed-mouthed sounds. The close-mouthed sounds of a lower frequency could travel long distances, which helped them communicate with the rest of the herd. They also puff up their cheeks with air during mating displays.

How big was a Dryosaurus?

Dryosaurus size was estimated to be 24-36 in (60.96-91.44 cm) in length and 72 in (182.88 cm) tall. The exact length of an adult dinosaur is not known since an adult fossil has not been found in the world.

How fast could a Dryosaurus move?

Dryosaurus altus species can move very fast. They can sprint at 50 mph (80.46 kph) and were probably some of the fastest dinosaurs of that world. It is almost as fast as a horse.

How much did a Dryosaurus weigh?

The weight of a Dryosaurus is 170-200 lb (77-90.7 kg). Its weight is six to seven times lighter than a Kodiak bear.

What were the male and female names of the species?

The males and females of this dinosaur species do not have any specific names. They are generally called female Dryosaurus and male Dryosaurus.

What would you call a baby Dryosaurus?

There are no particular names for the Dryosaurus dinosaur baby. The young dinosaurs are usually referred to as juveniles or babies.

What did they eat?

Dryosaurus was a herbivore. Its diet consisted of leaves, plants, conifers, ginkgo, and fruits. It has teeth in both lower and upper jaws but lacked teeth on the front of the upper jaw.

How aggressive were they?

The Dryosaurus dinosaur does not exhibit any aggressive behavior. They were usually in danger of being preyed on by carnivorous predators and thus lived in groups with large armored herbivores for protection. Their primary defense was their speed; if threatened or startled they would run away.

Did you know...

The genus name Dryosaurus is derived from the Greek 'drys' which means 'tree oak'. The species name altus means 'tall' in Latin. The dinosaur was named by O. C. Marsh.

Dryosaurus fossils showed that it followed craniofacial development growth patterns similar to other vertebrates. As juveniles, they had proportionally large eyes and proportionally short muzzles and as adults, their eyes became smaller and snout longer.

Dryosaurus was an ornithopod, whose intelligence is considered moderate among dinosaurs, but it had acute hearing and visual senses. The skull fossil had larger holes for the eyes and moderately sized hollows for the brain.

Did the Dryosaurus dig?

Yes, the female Dryosaurus dinosaur dug the ground. They placed their eggs underground and are covered by foliage. They use their beak to check the temperature of the eggs.

How fast could a Dryosaurus run?

The Dryosaurus dinosaur was a bipedal dinosaur and was probably one of the fastest dinosaurs of its time. They used to sprint away from danger for covering short distances very quickly. They had three toes on their feet out of which two toes touched the ground when they walked on ran and its stiff tail helped maintain balance. They could run at 50 mph (80.46 kph) speed. The speed of the dinosaur is calculated from its leg biology and the fossils of its footsteps if available.

Here at Kidadl, we have carefully created lots of interesting family-friendly dinosaur facts for everyone to discover! Learn more about some other dinosaurs from our Indosaurus facts and Pegomastax facts pages.

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


Second image by Kordite.

Written By
Kidadl Team

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