OXFORD READ AND DISCOVER 5 Animal Life Cycles.pdf

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Introduction
1 LifeCyctes
2 Insects
3 OtherInvertebrates
4 Fish
5 Amphibians
6 Reptites
7 Birds
8 Mammats
Activities
Projects
Glossary
3
4
8
L2
16
20
24
28
32
36
52
54
About Readand Discover 56
OX-FORD
lJNIVERSITY
PRESS
OXTORD
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Firstpublished2o1o
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No unauthorized
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by;
Aft
llhslrdlir)ns FiammettaDogirrlhe Agencypp.5,8;
pp.21,30i DusanPavlic/Beehive
Illustratiorr
Kclly Kennedy
46.
l)p.| 9, 4:1,
I 1tr' i 1rI)lish( rs would dlsolike to thonk thefollowingfor ther
ph\tographs othercowight
lrnri lrlrniJsx)nt(, rcproduct
and
Inrrl.ridi:Ahmy pp.3 (Michael Dietrich/imagebrokerrrblue-
(SimonColmer
lixtredbooby),l7 (PoelzerWolfgang),22
irn(l Al)l)y Rcx),28 (Michael Dietrich/imagebroker);Ardea.
({)rrrl).I 2 (Steve
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Corbis
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ZuckerDran)i
FLPA
Images/
l'i(lrrrcs);
cctty Imiges p.8 (Emilvon Maltitz/Gallo
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Hoddinott/
cro(odilc).6 (Pcrc
Oxford/tortoise), (Ross
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l0
(Fabio
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l8 (DougPeuine).19 (Fabio
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(David
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PhotoLibrary):
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Animals); SciencePhoto Library p.6 {Adrian Bicker/rnayfly);
p.7
still Pictures (McPhoto).
With thonk to: Ann Fullick for scierce checking
;:9,ffii'ffi,
growandchange
during
theirtife.Toproduce
Animals
young,
lay
havebabies, others eggs.
and
someanimals
young,
younganimals
These
thengrowup andproduce
youngis
from beingbornto producing
too.Thisjourney
Animallife cycles amazing.
are
calleda life cycle.
Howdo malebirds
finda mate?
Howbig is a babykangaroo
whenit's born?
Howdoes crocodile
her
a
carry babies?
growinto?
Whatdoes tadpole
a
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rsBN978o 19464512
Printedin China
This book is printed on PrPcr lir)|r (ertiliecllncl
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Nowread
moreabout
anddiscover
some
amazing
animal cycles!
life
ffi@eil@s
There mil[ions different
are
of
species animal the
of
in
world.
Some
animats, the bluewhale, verybig.
like
are
Others sosmallthatwe almost
are
can'tseethem.
These
animals have
all
verydifferent cycles.
life
2R
@
Animal
Groups
Scientists put animals into groups. The animals in
each group are the same in many ways, and they
often have very similar life cycles.The two biggest
animal groups are invertebrates and vertebrates.
Invertebrates are animals that have no backbone.
More than 95% of the animal speciesin the world
are invertebrates, and most of them are very small.
There are many different groups of invertebrates.
The biggest group is called arthropods. Insecrs,
spiders, and animals like crabs that have a hard
shell, are all arthropods.
Animals that have a backbone are called vertebrates.
Only a few percent of the animals in the world are
vertebrates, and most of them are much bigger than
invertebrates.Becauseof this, we seevertebrates
more often than invertebrates. Scientists put
vertebrates into five big groups - they are called
fish, amphibians, reptiles, birds, and mammals.
&r u
ftatworm
ocean
threadworm
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t.
All animals need to find food to stay alive. Some
animals are carnivores.
This means that they eat other
animals.Herbivores eat plants, and omnivores eat
plants and animals.
There are many dangers for animals.They have to
keep safe from predators - animals that hunt and eat
other animals.Peoplehunt birds and other animals.
People also cut down trees and build housesand roads
on land. \Whenthey do this, animals lose their homes
and their food. Many animals also become sick or die
becauseof pollution of the land, oceans,rivers, and
air. Life is very dangerousfor animals.Many animals
die before they are old enough to produce young.
Most speciesof animal have males and females.
Males produce sperm, and femalesproduce eggs.
llaby animals are made when sperm from the male
yoinstogether with an egg from the female.This is
called fertilization.
Some animals give birth to baby animals. Other
Their babies
animals,like reptiles and birds, lay eggs.
hatch - they break the egg open and come out.
Most reptiles and birds care for their babies.Most
insectsand fish do not care for their eggsor their
babies.All mammals care for their babies and feed
them milk. Some big mammals stay with their
babiesfor many years.
:.-i!.
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Different
animats for different
live
amounts
of
time.A Galapagos
tortoise livefor 150years,
can
but an adultmayfty
usually
livesforjust a few hours.
36-37for activities.
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