Egg to Owl

Put Things in Order Name some of the changes owls go through in their life cycle.. Extended Vocabulary down fl edge hatch nest nocturnal owlet Vocabulary larva life cycle pupa seed coat

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Scott Foresman Science 1.4

Nonfi ction Put Things in Order • Captions

• Labels

• Glossary

Life Cycles

ISBN 0-328-13744-8

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Scott Foresman Science 1.4

Nonfi ction Put Things in Order • Captions

• Labels

• Glossary

Life Cycles

ISBN 0-328-13744-8

ì<(sk$m)=bdheec< +^-Ä-U-Ä-U

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1 What is an owlet?

2 How old are owls when they are

ready to fl y?

3 Owls lay eggs

in nests Write to tell the places their nests can be Use words from the book as you write

4 Put Things in Order Name

some of the changes owls go through in their life cycle

Describe these changes in the order that they happen

What did you learn?

Extended Vocabulary

down

fl edge hatch nest nocturnal owlet

Vocabulary

larva

life cycle

pupa

seed coat

seedling

tadpole

Picture Credits

Every effort has been made to secure permission and provide appropriate credit for photographic material

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

Photo locators denoted as follows: Top (T), Center (C), Bottom (B), Left (L), Right (R), Background (Bkgd).

5 (T) Roger Tidman/Corbis.

ISBN: 0-328-13744-8

This publication is protected by Copyright, and permission should be obtained from the publisher prior to any

prohibited reproduction, storage in a retrieval system, or transmission in any form by any means, electronic,

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Permissions Department, Scott Foresman, 1900 East Lake Avenue, Glenview, Illinois 60025.

3 4 5 6 7 8 9 10 V010 13 12 11 10 09 08 07 06 05

by Jessica Quilty

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Plants and animals change as they grow

These changes are called life cycles Different

living things have different life cycles

A frog begins as an egg A tadpole hatches

out of the egg The tadpole grows to be a frog

Butterfl ies change and grow too They start

as an egg A larva, or caterpillar, hatches

from the egg It looks very different from

an adult butterfl y Next the larva

changes in a hard cover It is

then a pupa The pupa is

a butterfl y when it comes

out of the cover

This butterfl y has

just come out of

its hard cover.

What You Already Know

3

Plants change and grow Many plants begin as seeds Seed coats are hard covers that keep seeds safe Seedlings grow from seeds These young plants can then grow

fl owers, stems, and leaves

Trees are plants Some trees have fl owers Some trees have cones Trees grow and change

Just like other living things, owls have life cycles Owls change and grow in many ways You are now going to read about some of the ways owls change and grow

Barn owl

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Finding a Nest

An owl needs a good nest so it can lay

eggs Different owls fi nd nests in different

places Barn owls do not build their own

nests They use nests they fi nd

5

Barn owls use nests in caves and in trees

They will also nest in the roofs of buildings

Owl nests protect eggs They help to keep eggs safe from other animals They also help keep owls, eggs, and babies warm

Owl eggs

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Hatching

Barn owls wait for their eggs to hatch

Mother owls sit on the eggs The eggs need

to stay warm

After about thirty days an egg begins

to hatch Barn owls lay one egg at a time

They may wait one day to lay another egg

The eggs hatch in order

The owlet breaks the egg

It starts to come out.

7

Baby owls are called owlets Crack by crack they make their way out of their eggs

The owlets are very small They have down

Down is soft feathers This down goes away

as they grow

Slowly, the owlet comes out.

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Growing Fast

Owlets go through many changes

Their down falls off after a week They

then grow new down This new down is

a thick, heavy covering It protects the

owlets for about seven weeks

One-week-old owl

9

Owlets have a lot of growing to do They are always hungry! Their parents are very busy hunting for food to feed them Owlets start becoming tall and strong when they are about three or four weeks old

Three-week-old owl

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Getting Big

10

Six-week-old owl

The owlets are much heavier and much

bigger at six weeks old They are almost as big

as they will get But they are not ready to leave

the nest The young owls try to fl y and hunt

on their own

11

When they are about seven weeks old, the owlets

fl edge This means they grow the adult feathers they need to

fl y Now the owlets are big and strong They are almost ready

to leave their nests and see the world on their own!

An eight-week-old owl is almost ready to fl y away.

Eight-week-old owl

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Young Adult

12

Ten-week-old owl

After barn owls grow their adult feathers,

they have grown big and strong Now they

are ready to fl y! The owls begin by taking

short trips away from their nest At nine weeks

old they are able to stay away for more time

13

Barn owls are nocturnal, which means they hunt at night When the owls are old enough, they hunt for food all through the night

When they are about a year old, the owls will begin looking for their own nests They might lay their own eggs!

Owls fl y away from and then back to their nests.

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From Egg to Owl

14

Just hatched

The barn owl life cycle begins with an

egg After about one month in the eggs,

the baby owls, called owlets, hatch Once

they hatch, they grow very fast! They get

bigger and stronger

One week old

Three weeks old

15

The owlets have down Their down changes Soon they grow their fl ying feathers

They are grown owls when they are twelve weeks old Then they are ready to leave the nest and begin their nighttime adventures!

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16

made of plant and animal parts