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1、www.readinga-Visit www.readinga- for thousands of books and materials.LEVELED BOOK OWritten by Charles C.HoferWheres Your Hair?A Reading AZ Level O Leveled BookWord Count:682Wheres Your Hair?www.readinga-Wheres Your Hair?Level O Leveled Book Learning AZWritten by Charles C.HoferAll rights reserved.w
2、ww.readinga-Written by Charles C.HoferWheres Your Hair?CorrelationLEVEL OM2028Fountas&PinnellReading RecoveryDRAPhoto Credits:Front cover,pages 9,15:Jean-Michel Labat/;back cover:Eddie Boldizsar/REX USA;title page,page 8:GlobalP/iStock/Thinkstock;page 3:Jacqueline Hunkele/iStock/Thinkstock;page 4:GR
3、OSSEMY VANESSA/Alamy;page 5:Juniors Bildarchiv GmbH/Alamy;page 6:Tierfotoagentur/Alamy;page 10:Phil Yeomans/REX USA;page 11(top):krechet/iStock/Thinkstock;page 11(bottom):allesalltag/Alamy;page 12:Wade Payne/AP Images;page 13:Frans Lanting Studio/Alamy;page 14(top):Peter Zigich/Hemera/Thinkstock;pag
4、e 14(bottom):Andrey Nekrasov/imagebroker/CorbisBack Cover:A Chinese crested dog enjoys(?)a bath.Front Cover:The fantastic(and hairless)four:a Mexican xolo dog,sphynx cat,guinea pig,and ratTitle Page:A Chinese crested puppy shows us its good side.Page 3:A sphynx cat nuzzles her kitten.34Table of Cont
5、entsWhat Makes a Mammal?.4Hairless Dogs .5Cool Cats .8Skinny Pigs and Fancy Rats .10Hairless in the Wild .12Hairless All Around Us .15Glossary .16 What Makes a Mammal?All mammals have certain things in common.They are warm-blooded,they nurse their young,and mostnot allhave hair.Some mammals have lot
6、s of hair,while others have almost none at all.Some mammalsnormally hairyhave been bred to be hairless.Many common pets include hairless breeds.There are hairless dogs,hairless cats,and even hairless guinea pigs.Hairless mammals can be found in the wild,too.Look around you.Hairless animals are every
7、where!hairless and longhair Chinese crested dogsWheres Your Hair?Level O34Table of ContentsWhat Makes a Mammal?.4Hairless Dogs .5Cool Cats .8Skinny Pigs and Fancy Rats .10Hairless in the Wild .12Hairless All Around Us .15Glossary .16 What Makes a Mammal?All mammals have certain things in common.They
8、 are warm-blooded,they nurse their young,and mostnot allhave hair.Some mammals have lots of hair,while others have almost none at all.Some mammalsnormally hairyhave been bred to be hairless.Many common pets include hairless breeds.There are hairless dogs,hairless cats,and even hairless guinea pigs.H
9、airless mammals can be found in the wild,too.Look around you.Hairless animals are everywhere!hairless and longhair Chinese crested dogsWheres Your Hair?Level O56Hairless DogsHairless dogs have a long history.The xolo(SHOW-low)is a hairless dog breed that has been around for more than three thousand
10、years.Some believe xolos followed early humans when they first moved to Central America.Today,the xolo is the national dog of Mexico.Peru is home to hairless Inca orchids,one of the rarest dog breeds in the world.Most hairless Inca orchids have a little tuft of hair on their head.It almost looks lik
11、e a furry wig!Not all Inca orchids are hairless,though.Both hairy and hairless Inca orchids can be found in the same litter.How can that be?The answer is genes.Genes are instructions for your cells.They help make you who you are,from the color of your hair to how tall you will grow.Peruvian Inca orc
12、hidMexican xoloWheres Your Hair?Level O56Hairless DogsHairless dogs have a long history.The xolo(SHOW-low)is a hairless dog breed that has been around for more than three thousand years.Some believe xolos followed early humans when they first moved to Central America.Today,the xolo is the national d
13、og of Mexico.Peru is home to hairless Inca orchids,one of the rarest dog breeds in the world.Most hairless Inca orchids have a little tuft of hair on their head.It almost looks like a furry wig!Not all Inca orchids are hairless,though.Both hairy and hairless Inca orchids can be found in the same lit
14、ter.How can that be?The answer is genes.Genes are instructions for your cells.They help make you who you are,from the color of your hair to how tall you will grow.Peruvian Inca orchidMexican xoloWheres Your Hair?Level O78regular(hairy)geneGenes are passed down from parents to children,but not every
15、child gets the same genes.Thats why siblings often look like their mother and father,but in different ways.In the animal world,a hairless dog or cat is also the result of genes.If the same hairless gene is passed down over several generations,it can lead to a new hairless breed.Hairless breeds somet
16、imes need help to survive.Since hair helps keep a mammal warm,many pet owners use sweaters to warm their hairless pets.They also take care to protect their pets from sunburn.Cool CatsUnlike hairless dogs,hairless cat breeds have only been around for a few decades.The beautiful sphynx cat is a result
17、 of a genes natural mutation.That mutation led to a new breed of cat.Today,the sphynx is the most popular of all hairless cats.sphynx catMutant MagicSometimes a gene can change unexpectedly.That change is called a mutation.Most hairless animal breeds are caused by such a mutation.The gene that was s
18、upposed to instruct the body to grow hair changed.That gene was then passed down to the children.and a hairless breed was born!If a kitten gets a hairless gene from one parent,it can pass that gene along to its kittens someday.If a kitten gets a hairless gene from both parents,it will be hairless.ha
19、irlesshairyhairyhairyhairyhairyhairless geneGenes Behind the ScenesWheres Your Hair?Level O78regular(hairy)geneGenes are passed down from parents to children,but not every child gets the same genes.Thats why siblings often look like their mother and father,but in different ways.In the animal world,a
20、 hairless dog or cat is also the result of genes.If the same hairless gene is passed down over several generations,it can lead to a new hairless breed.Hairless breeds sometimes need help to survive.Since hair helps keep a mammal warm,many pet owners use sweaters to warm their hairless pets.They also
21、 take care to protect their pets from sunburn.Cool CatsUnlike hairless dogs,hairless cat breeds have only been around for a few decades.The beautiful sphynx cat is a result of a genes natural mutation.That mutation led to a new breed of cat.Today,the sphynx is the most popular of all hairless cats.s
22、phynx catMutant MagicSometimes a gene can change unexpectedly.That change is called a mutation.Most hairless animal breeds are caused by such a mutation.The gene that was supposed to instruct the body to grow hair changed.That gene was then passed down to the children.and a hairless breed was born!I
23、f a kitten gets a hairless gene from one parent,it can pass that gene along to its kittens someday.If a kitten gets a hairless gene from both parents,it will be hairless.hairlesshairyhairyhairyhairyhairyhairless geneGenes Behind the ScenesWheres Your Hair?Level O910Russia is home to the peterbald.Th
24、ough it may look like a grouchy space alien,its a friendly and very playful breed of hairless cat.Because its so active,the peterbald has a high body temperature.This makes the peterbald a warm and cuddly pet year round!Hairless cats are happy to seek out a warm lap to sit on.Although they lack a th
25、ick coat of fur,most actually have a very fine coat.When petted,a hairless cat feels like a fuzzy peach.Skinny Pigs and Fancy RatsGuinea pigs are a popular hairless rodent.One hairless breed of guinea pig is called the“skinny pig.”This guinea pig looks skinny because it doesnt have a thick coat of f
26、uzzy fur like regular guinea pigs.Unlike their furry cousins,skinny pigs need special care.Without a coat of fur to protect them,skinny pigs can easily injure their skin or get sick.They need to stay indoors where its safe.peterbald catskinny pigWheres Your Hair?Level O910Russia is home to the peter
27、bald.Though it may look like a grouchy space alien,its a friendly and very playful breed of hairless cat.Because its so active,the peterbald has a high body temperature.This makes the peterbald a warm and cuddly pet year round!Hairless cats are happy to seek out a warm lap to sit on.Although they la
28、ck a thick coat of fur,most actually have a very fine coat.When petted,a hairless cat feels like a fuzzy peach.Skinny Pigs and Fancy RatsGuinea pigs are a popular hairless rodent.One hairless breed of guinea pig is called the“skinny pig.”This guinea pig looks skinny because it doesnt have a thick co
29、at of fuzzy fur like regular guinea pigs.Unlike their furry cousins,skinny pigs need special care.Without a coat of fur to protect them,skinny pigs can easily injure their skin or get sick.They need to stay indoors where its safe.peterbald catskinny pigWheres Your Hair?Level O1112Another hairless ro
30、dent is a rat known as the“fancy rat.”Rats are mostly social animalsthey like to be around other rats.Putting hairless fancy rats together with furry rats(fancy or not so fancy)helps keep them happy and in good health.Neither rat nor mole,it turns out naked mole rats arent entirely naked,either.Hair
31、s between their toes help them sweep away dirt while they are digging tunnels.furry and hairless ratA Hairless Solution?An allergy is your bodys reaction to something it doesnt like.Sneezing,itchy eyes,sore throatthese can all be caused by allergies.Some people are allergic to hairy pets.An allergic
32、 reaction to a pet is usually caused by the animals dander,or small flakes of skin.All pets have dander,but hairless pets dont have a thick coat of fur to trap the dander.Regular cleaning of a hairless petand your homemay reduce the sniffling and sneezing caused by pet allergies.Hairless in the Wild
33、Hairless animals are found in the wild,too.These animals have adapted to live without a lot of hair.The naked mole rat is a funny-looking rodent that doesnt have thick fur like most rats.Instead it is covered in wrinkly pink skin.Wheres Your Hair?Level O1112Another hairless rodent is a rat known as
34、the“fancy rat.”Rats are mostly social animalsthey like to be around other rats.Putting hairless fancy rats together with furry rats(fancy or not so fancy)helps keep them happy and in good health.Neither rat nor mole,it turns out naked mole rats arent entirely naked,either.Hairs between their toes he
35、lp them sweep away dirt while they are digging tunnels.furry and hairless ratA Hairless Solution?An allergy is your bodys reaction to something it doesnt like.Sneezing,itchy eyes,sore throatthese can all be caused by allergies.Some people are allergic to hairy pets.An allergic reaction to a pet is u
36、sually caused by the animals dander,or small flakes of skin.All pets have dander,but hairless pets dont have a thick coat of fur to trap the dander.Regular cleaning of a hairless petand your homemay reduce the sniffling and sneezing caused by pet allergies.Hairless in the WildHairless animals are fo
37、und in the wild,too.These animals have adapted to live without a lot of hair.The naked mole rat is a funny-looking rodent that doesnt have thick fur like most rats.Instead it is covered in wrinkly pink skin.Wheres Your Hair?Level O1314Naked mole rats spend their entire life below the ground in tunne
38、ls.To control their body temperature,they move around.When its warm out,naked mole rats move to deeper tunnels where its cooler.When its cold,the mole rats group together to keep each other warm.When two naked mole rats want to pass each other in a tunnel,the smaller one usually crouches down so the
39、 larger one can crawl over.Hairless AdaptationsSome mammals have adapted to live in places where they dont need a lot of hair.Elephants and rhinoceroses have thick skin to help protect them from the sun and heat where they live.Whales and dolphins live in the ocean.Instead of hair,a thick layer of b
40、lubber,or fat,helps these mammals stay warm in the chilly water.Humans are nearly hairless,too.Instead of fur,we wear coats when were cold and shorts when were hot.We heat our homes during winter and cool them during summer.Like these other mammals,weve adapted to live without(much)hair.Asian elepha
41、ntbeluga whaleWheres Your Hair?Level O1314Naked mole rats spend their entire life below the ground in tunnels.To control their body temperature,they move around.When its warm out,naked mole rats move to deeper tunnels where its cooler.When its cold,the mole rats group together to keep each other war
42、m.When two naked mole rats want to pass each other in a tunnel,the smaller one usually crouches down so the larger one can crawl over.Hairless AdaptationsSome mammals have adapted to live in places where they dont need a lot of hair.Elephants and rhinoceroses have thick skin to help protect them fro
43、m the sun and heat where they live.Whales and dolphins live in the ocean.Instead of hair,a thick layer of blubber,or fat,helps these mammals stay warm in the chilly water.Humans are nearly hairless,too.Instead of fur,we wear coats when were cold and shorts when were hot.We heat our homes during wint
44、er and cool them during summer.Like these other mammals,weve adapted to live without(much)hair.Asian elephantbeluga whaleWheres Your Hair?Level O1516Hairless All Around UsHairless animals are everywhere.They can be wild animals or cuddly pets.Some hairless animal breeds are thousands of years old,wh
45、ile others are brand new.Who knows what kind of hairless animal will pop up next?Glossaryadapted(v.)changed to fit a new or specific situation or environment(p.12)breeds(n.)groups of animals or plants that are alike as a result of controlled reproduction(p.4)bred(v.)cared for an animal or plant in o
46、rder to produce a certain kind of offspring(p.4)genes(n.)tiny carriers of information by which living things transfer traits from one generation to the next(p.6)mammals warm-blooded animals with (n.)a backbone and hair or fur that nurse their young and have babies that are born live(p.4)mutation a c
47、hange in the genes from (n.)one generation to the next that may change how an offspring grows and what it can do(p.8)Who you calling hairless?Three hairless breedsPeruvian Inca orchid,Mexican xolo,and Chinese crestedare ready to stand up for hairless pets everywhere.Wheres Your Hair?Level O1516Hairl
48、ess All Around UsHairless animals are everywhere.They can be wild animals or cuddly pets.Some hairless animal breeds are thousands of years old,while others are brand new.Who knows what kind of hairless animal will pop up next?Glossaryadapted(v.)changed to fit a new or specific situation or environm
49、ent(p.12)breeds(n.)groups of animals or plants that are alike as a result of controlled reproduction(p.4)bred(v.)cared for an animal or plant in order to produce a certain kind of offspring(p.4)genes(n.)tiny carriers of information by which living things transfer traits from one generation to the ne
50、xt(p.6)mammals warm-blooded animals with (n.)a backbone and hair or fur that nurse their young and have babies that are born live(p.4)mutation a change in the genes from (n.)one generation to the next that may change how an offspring grows and what it can do(p.8)Who you calling hairless?Three hairle