AR34 173 W  Tyrannosaurus Rex, the King of Dinosaurs

A long time ago, dinosaurs lived on Earth. One of the biggest and strongest was the Tyrannosaurus Rex. People call it T-rex for short. It lived about 68 million years ago. T-rex walked on two legs. It had big feet and a long, heavy tail to help it balance. T-rex was a meat-eat...

AR34 154 W  Triceratops, the Dinosaur with Three Horns

Triceratops was a plant-eating dinosaur. It lived a long time ago, just like T. rex. The name "Triceratops" means "three-horned face." This is because it had three big horns on its head. Two horns were above its eyes, and one was on its nose. Triceratops had a big frill behind...

AR34 185 W  How Big Was a Brachiosaurus?

A Brachiosaurus was one of the biggest dinosaurs that ever lived. It walked on four legs and had a very long neck. Its neck was as long as a school bus! This helped the Brachiosaurus eat leaves from tall trees. Its body was very heavy. It could weigh as much as four elephants! ...

AR34 146 W  Why Did Dinosaurs Disappear?

Dinosaurs lived a long, long time ago. They were on Earth for millions of years. Then, one day, they all disappeared. But why? Many scientists believe a big asteroid hit the Earth. The asteroid was very large and fast. When it crashed, it made a huge explosion. It also caused ...

AR34 138 W  How Are Fossils Made?

Fossils are the remains of animals and plants from long ago. They help us learn about the past. But how are fossils made? When an animal dies, its body may fall into mud, sand, or water. Most of the body rots away, but sometimes bones, teeth, or shells stay. Over time, more mu...

AR34 135 W  Could a Velociraptor Run Fast?

The Velociraptor was a small but smart dinosaur. It had sharp teeth and claws. It walked on two legs and had a long tail to help it balance. Velociraptors were fast runners. They could run quickly to catch other animals. Some scientists think they could run as fast as a car in...

AR34 137 W  Did Pterosaurs Fly in the Sky?

Pterosaurs were flying reptiles that lived with the dinosaurs. They were not dinosaurs, but they lived at the same time. Pterosaurs had wings made of skin and muscle. Their wings were like those of a bat. Some pterosaurs were small, like birds. Others were very big, with wings...

AR34 133 W  Did Plesiosaurs Live in the Ocean?

Plesiosaurs were large reptiles that lived in the ocean. They were not dinosaurs, but they lived at the same time. Plesiosaurs had long necks, small heads, and big bodies. They also had four wide flippers to help them swim. They used their flippers like paddles. This helped th...

AR34 149 W  Did Dinosaurs Lay Eggs?

Long ago, dinosaurs walked on Earth. Some were big like buildings, others were small like dogs. But how did they have babies? Dinosaurs did not have babies like people. They laid eggs. Just like birds and reptiles today, dinosaurs made nests. They laid eggs in those nests and ...

AR34 184 W  What Did Ancient Animals Look Like?

Long ago, strange animals lived on Earth. Some were big, and some were small. Dinosaurs were the most famous. Some dinosaurs had long necks. Others had big teeth and strong legs. One big dinosaur was the Tyrannosaurus rex. It had short arms but a very big mouth. Another dinosaur,...

AR34 150 W  What Is a Mammoth?

A mammoth was a big, furry animal that lived long ago. It looked like an elephant but had long, curved tusks and thick hair. Mammoths lived in cold places, where snow and ice covered the ground. Their thick fur kept them warm. Some mammoths were as tall as a house. They ate gr...

AR34 143 W  What Did a Saber-Tooth Cat Look Like?

A saber-tooth cat was a big wild cat that lived long ago. It looked like a lion but had two long, sharp teeth. These teeth were called fangs. The fangs were very strong and could be as long as a banana. Saber-tooth cats had short tails, strong legs, and big paws. They could ru...

AR34 148 W  Where Did Ammonites Live?

Ammonites were sea animals that lived a long time ago. They had hard, spiral shells, like a snail. Their shells were round and had many rings. Ammonites used their shells to float and swim in the ocean. They lived in warm seas and swam near the surface. Some were small, and so...

AR34 125 W  Did Dinosaurs Eat Plants?

Yes, some dinosaurs ate plants. These dinosaurs were called herbivores. They had flat teeth to chew leaves, grass, and fruits. They did not eat meat. One famous plant-eating dinosaur was the Triceratops. It had three horns and a big frill on its head. It used its beak to bite ...

AR34 128 W  Why Did Dinosaur Footprints Stay?

Long ago, dinosaurs walked on soft ground like mud or sand. When they stepped, their feet made deep prints. Sometimes, it rained after the dinosaurs walked. The rain helped the prints stay in the ground. Over time, more mud and sand covered the footprints. The ground got hard ...

AR34 132 W  Where Did Ancient Creatures Live?

Ancient creatures lived in many different places. Some lived in the ocean. They swam with fins and had soft or hard bodies. Ammonites and trilobites lived under the sea. They moved slowly and looked for food in the sand. Other creatures lived on land. Dinosaurs walked through ...

AR34 128 W  Are Dinosaurs Still Alive Today?

Most dinosaurs are not alive today. They became extinct a long time ago. A big change on Earth, like a giant rock from space, may have caused them to disappear. Many animals and plants died at that time. But not all dinosaurs are gone. Scientists say birds are living dinosaurs...

AR34 145 W  Who Finds Fossils?

A person who finds fossils is called a paleontologist. Fossils are old bones, footprints, or parts of plants and animals. Paleontologists study these fossils to learn about life long ago. They look for fossils in dry places like deserts, mountains, and cliffs. When they find a...

AR34 132 W  Did Dinosaurs Live in Groups?

Some dinosaurs lived alone, but many lived in groups. These groups are called herds. Living in a herd helped dinosaurs stay safe. When many dinosaurs were together, they could watch for danger and help each other. Plant-eating dinosaurs often stayed in herds. Triceratops and B...

AR34 152 W  Who Names the Dinosaurs?

When a new dinosaur is found, scientists give it a name. These scientists are called paleontologists. They study the bones and learn about the new dinosaur. Then they choose a special name for it. Most dinosaur names come from Greek or Latin words. The names often describe the...

AR34 138 W  Why Are Only Dinosaur Bones Left?

Dinosaurs lived a very long time ago. When they died, their soft parts, like skin and muscles, broke down. Wind, rain, and tiny animals helped the body disappear. But the hard bones stayed in the ground. Sometimes, the bones were quickly covered by mud, sand, or water. Over ti...

AR34 128 W  Where Are Fossils Found?

Fossils are found in many places around the world. Most fossils are found in rocks, especially in dry areas like deserts or cliffs. These places used to be rivers, lakes, or oceans long ago. Over time, animals and plants were buried by mud and sand. Their bodies slowly turned ...

AR34 147 W  What Sounds Did Ancient Animals Make?

We don¡¯t know exactly what sounds ancient animals made, but scientists have ideas. Dinosaurs and other ancient animals didn¡¯t leave behind recordings. But their bones and body shapes give us clues. Some dinosaurs had big heads or long crests. These parts may have helped them...

AR34 144 W  What Did Dinosaur Eggs Look Like?

Dinosaur eggs came in many shapes and sizes. Some eggs were round like a ball. Others were long like a potato. The eggs could be as small as a tennis ball or as big as a football. Their size depended on the type of dinosaur. Most dinosaur eggs had hard shells. Some shells were...

AR34 136 W  Were Dinosaurs Active at Night?

Some dinosaurs were active during the day, and some were active at night. Scientists study dinosaur eye shapes to find out when they were awake. If a dinosaur had big eyes with wide pupils, it may have seen well in the dark. Meat-eating dinosaurs like Troodon had large eyes. T...

AR34 138 W  What Was Dinosaur Skin Like?

Dinosaur skin came in many types. Some dinosaurs had rough, bumpy skin like a crocodile. Others had flat, scaly skin like a lizard. The skin helped protect them from sun, rain, and enemies. Fossils show that some dinosaurs had tiny bumps or plates on their skin. These may have...

AR34 140 W  Why Did Dinosaurs Have Long Tails?

Many dinosaurs had long tails, and they used them in different ways. One reason was balance. Dinosaurs like Brachiosaurus had big bodies and long necks. Their tails helped them stay balanced while walking or eating leaves from tall trees. Some dinosaurs used their tails to fig...

AR34 151 W  How Did Dinosaurs Drink Water?

Dinosaurs needed water to stay alive, just like animals today. They drank water from rivers, lakes, and ponds. Small dinosaurs may have bent down and sipped water like birds. They used their mouths or beaks to take small gulps. Big dinosaurs, like Brachiosaurus, had long necks...