3.9 Dinosaurs Lesson

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3.9 Dinosaurs

by Jeffrey Reed

Dinosaurs

• Dinosaurs are a diverse group of reptiles of the clade Dinosauria.

• They first appeared during the Triassic period, between 243 and 233.23 million years ago.

• They went extinct about 65 million years ago.

• Birds evolved from small theropod dinosaurs.

• More than 300 species of dinosaurs have been discovered.

Now, from movies such as Jurassic world or Jurassic park we learnt a few things of dinosaurs.

Dinosaurs

• As you know dinosaurs died off about 65 million years ago.

• The name dinosaur means terrible lizard.

• There were many different kinds of dinosaurs to.

• In this lesson you are going to learn all about them.

The Tyranosaurus rex

• It had about 60 razor sharp teeth good for ripping apart prey.

• prey - an animal hunted for food.

• A T-rex could eat over 60 pounds of meat a day.

• It had a long tail for balance

• Instead of walking on its feet the T-rex walked on tippy toes!

TYRANNOSAURUS

• was one of the biggest carnivores.

• had strong legs and short arms with sharp claws.

• had head as big as a small car.

• had very strong teeth.

Multiple Choice

What are prey?

• An animal eaten by other animals.

• Animals that play together.

• An animal that eats plants.

Triceratops

• Triceratops was an herbivore

• An Herbivore is an animal that eats plants.

• The Triceratops had a sharp beak shaped mouth to eat plants all day.

• The Triceratops had three horns on its head that it used both to protect itself but the males also used them to fight each other for a mate.

• Triceratops lived in large herds.

• herds - a large group of the same animal that stay together.

Multiple Choice

An animal that mainly eats plants is a(n) _______.

• carnivore
• omnivore
• insectivore
• herbivore

Ankylosaurus

• The Ankylosaurus had plates of armor on their backs and a heavy club on their tails.Their only weak spot was their belly.

• armor - a hard covering to protect the animal from attack.

• They used their club tails to defend themselves against predators like the Tyranosaurus rex.

• They also lived in heards and ate plants.

Multiple Choice

A hard protective covering is called ______.

• skin

• fat

• teeth

• armor

Pteredactyl

• Many people think the the Pteredactyl (pterodactylus) was a dinosaur but it actually wasn't! It was a flying reptile.

• reptile - an animal with a backbone and scales.

• The Pteredactyl had wings, a short tail, feet with tallons, and a sharp beak for catching fish.

​Pterosaurs

They hunt prey on the sea surface. It has a very long beak & many tiny teeth.

Multiple Choice

An animal with a backbone, scales and lays eggs on land is a _______.

• insect
• mammals

• bird
• reptile

DIPLODOCUS

• was longer than most other dinosaurs.

• was as long as two buses and a car!

• had a very long neck.

• ate plants and tree leaves.

Multiple Select

Select the two dinosaurs that are carnivores

Multiple Choice

Was T Rex a carnivore?

• No

• Yes

Multiple Choice

Which kind of animal evolved from dinosaurs? Hint:evolve means to turn into a new species

• Birds

• Humans

• Fish

• Elephants

​Dinosaurs on land

​Parasaurolophus

• ​ It has a small comb teeth for eating plants.

• They ate lots of plants and could walk on two and four feet.
  

Parasaurolophus

• The Parasaurolophus had a curved hollow crest on its head. They would make these crests vibrate and it would seem like their crests were singing.

• They lived in small family groups.

• They also liked to be in the water.

​Triceratop

• ​It has a beak like parrot.

• It is a herbivore.

• It uses its neck & long horn to protect itself.

• They lived in large herds.

​Stegosaurus

• ​It has a small head but a heavy body.

• It has a very sharp bone on its tail to protect itself.

• Its back plates can use to adjust its body temperature.

• It was a herbivore.

Dinosaurs in the water​

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Spinosaurus

• The Spinosaurus was bigger than the T-rex and ate lots of fish.

• As its name sugests the Spinosaurus has a big spine on its back.

• It had a long mouth with razor teeth for catching fish.

• Of course it was a great swimmer and spent most of its time in or near water.

​Ammonite

• ​Only live in water.

• It is the ancestor of octopus and squid.

• Its bodu hide inside the shell.

• It was not a dinosaur

• It was found all around the world.

​Elasmosaurus

• ​It has a very small head.

• It has sharp teeth.

• It eats fish.

• Existed from 93.9 million years ago to 70.6 million years ago

• Lived in a marine environment

• Reproduced by live birth

• A carnivore

​Mosasaurus

• ​It is a very ferocious dinosaurs.

• It has a big head. It is a carnivore.

• It is called "The T-Rex In The Sea".

• Mosasaurus is thought to have given birth to live young

• Mosasaurus was not a dinosaur.

• reached lengths of around 56 ft. / 17.1 m.

​Dimorphodon

• ​It has a big head.

• The front of the mouth has many big, sharp teeth, the back has many small, sharp teeth.

• It eats insects.

​Archaeopteryx

• ​It cannot fly a long time at the sky.

• It needs to climb to a very high place and leap to the sky.

• It eats insects.

• Weighed about .5 to 1 Kilogram.

• Now regarded as the link between dinosaurs and birds.

Dinosaurs

How do we know about Dinosaurs?

Special Scientists called "Palentologists" learn about dinosaurs.

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They study fossils.

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Fossils are bones, eggs, teeth, scales, or plants left behind from long ago.​

Fossils that leave marks in the ground.

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Footprints, shells, and more can make a mark​

Do you want to make one?

Impression Fossils

The same shape and size as dinosaur bones.

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Made of rock and minerals​.

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Not real!​

We can make this too

Cast Fossils

​ACTUAL REAL DINOSAUR OR ANIMAL PIECES.

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VERY, VERY OLD TEETH, BONES, LEAVES, OR EGGS​

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Preservation Fossils

It was around 240 million years ago that the first dinosaurs appear in the fossil record. These dinosaurs were small, bipedal creatures that would have darted across the variable landscape.

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Dinosaurs in the Triassic Period

​Why?

• ​This is an artists drawing of the crater from the asteroid that killed off the dinosaurs.

• The image shows the ring of cenotes outlining the crater.
  

• crater - a bowl shaped hole.

​asteroid - a small rocky body that travels around the sun.
fossil record - layers of rock containing fossils.
paleontologist - a scientist who studies rocks and fossils to learn about living things of the past.

Multiple Choice

A mass extinction occurred about 65.5 mya.

• True

• False

Multiple Choice

What is this?

• Claw

• Tail

• Feather

• Wing

Multiple Choice

What species of dinosaur is this?

• Triceratops
• Torosaurus
• Utahceratops
• Pachyrhinosaurus

Multiple Choice

Scientists have discovered more than 300 species of dinosaurs.

• True

• False