Pearson - All Animals Have Life Cycles

8/17/2019 Pearson - All Animals Have Life Cycles

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Genre Comprehension Skill Text Features Science Content

Nonfiction State the Purpose • Captions

• Labels

• Diagrams

• Glossary

Animal Life Cycles

Scott Foresman Science 2.4

Standards

Preview

Standard Set 2. Life Sciences

2. Plants and animals havepredictable life cycles. As a basis forunderstanding this concept:

2.b. Students know the sequentialstages of life cycles are different fordifferent animals, such as butterflies,frogs, and mice.

ISBN 0-328-23504-0

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Life Sciences

by Kristin Cashore



Vocabulary

amphibianinsect

larva

life cyclemammal

pupa

tadpole

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publisher deeply regrets any omission and pledges to correct errors called to its attention in subsequent editions.

Unless otherwise acknowledged, all photographs are the copyright of Dorling Kindersley, a division of Pearson.

ISBN: 0-328-23504-0

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All Animals Have

Life Cycles

by Kristin Cashore



2

The Life Cycles ofLiving Things

Living things grow and change. A kitten doesnot stay a kitten. It grows into an adult cat.

A life cycle is the way a living thing growsand changes. All animals have life cycles.

Cats have life cycles.

3

Every life cycle has stages. At each stage,the animal looks different. All animals changesize as they grow. Many animals also changeshape. Some animals even change color!

A caterpillar and abutterfly are part ofthe same life cycle.



4

Different Life CyclesDifferent animals have different life cycles.

A mammal is one kind of animal. Mammalshave hair or fur on their bodies. Skunks are

mammals. Dogs and cats are mammals too.

Giraffes are mammals.Their bodies have hair.

5

Young mammals look a lot like their parents.Mammals grow bigger as they get older. Somemammals also change color as they get older.

Elephants are mammals.They grow bigger as theyget older.



6

Young Insects and AmphibiansAn insect is an animal with three body parts

and six legs. A ladybug is a kind of insect. Antsand butterflies are insects too.

Young insects look very different from theirparents. Insects change size, shape, and coloras they get older.

Ladybug eggs

An adult ladybug

7

An amphibian is an animal that lives partof its life in the water. It lives the other part ofits life on land. Newts are amphibians. Frogsand toads are also amphibians.

Young amphibians look different from theirparents. Amphibians change size, shape, andcolor as they get older.

How is the young newt(left) different from theadult newt (below)?



8

What is the lifecycle of a toad?

A toad is an amphibian. It starts life as anegg. The egg hatches and a tadpole swims out.A tadpole is a very young toad or frog.

A tadpole lives only in water. It has a tail,but it does not have legs. Soon the tadpolestarts to change. It grows back legs. Then itgrows front legs. Its tail starts to get smaller.

A toad egg

A young tadpole

An adult tadpole

9

Finally, the tadpole starts to look like a toad!An adult toad has four legs. It does not have atail. It can live on land or in the water.

The adult toad may lay eggs in the water.

Then the life cycle starts over.

An adult toad



10

What is the lifecycle of a horse?

A horse is a mammal. Baby horses are calledfoals. Foals look like their parents. Foals canstand up an hour after they are born!

A foal

A young horse

11

A female foal grows into a filly. A male foalgrows into a colt. Colts and fillies look more likeadult horses than foals. After two or three yearscolts and fillies become adult horses. Then they

can have foals of their own.

An adult horse



12

What is the lifecycle of a butterfly?

Many insects have life cycles that are fourstages. A butterfly is an insect. Its life cycle hasfour stages. A butterfly starts life as an egg.

Then a larva hatches from the egg. This isthe next stage. A larva is a young insect. Abutterfly larva is called a caterpillar.

butterfly egg

caterpillar

pupa

13

The caterpillar turns into a pupa. Its wingsstart to grow.

The pupa turns into an adult butterfly in thefinal stage of the life cycle. The butterfly looks

very different from the caterpillar!The adult butterfly may lay eggs. Then thelife cycle of the butterfly starts over.

young butterfly

adult butterfly



14

What is the lifecycle of a dragonfly?

A dragonfly is an insect. Its life cycle hasthree stages. A dragonfly starts life as an egg.

The dragonfly egg hatches. A youngdragonfly crawls out. It is called a nymph. Thenymph looks a lot like an adult dragonfly. It hasthree body parts and six legs. The nymph doesnot have wings.

dragonfly egg

nymph

15

The nymph grows bigger. It grows two setsof wings. Finally, it becomes an adult dragonfly!

The adult dragonfly may lay eggs. Then thelife cycle of the dragonfly starts over.

adult dragonfly



16

amphibian an animal that lives part of itslife in water and part on land

insect an animal that has three bodyparts and six legs

larva a young insect

life cycle the way a living thing grows and

changes

mammal an animal that has hair or fur onits body

pupa the stage after the larva in someinsects’ life cycles

tadpole the second stage of a frog’s lifecycle

GlossaryWhat did you learn?

1. What are some ways a mammal may changeduring its life cycle?

2. What are the three stages of a horse’s lifecycle?

3. All animals grow and

change. Describe how a class pet or one youhave at home has grown and changed sinceyou first saw it.

4. State the Purpose Go back to thecaption on page 7. What is its purpose?

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Pearson - All Animals Have Life Cycles