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    [DK书籍].Desert.(DK.24.HOURS).pdf

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    [DK书籍].Desert.(DK.24.HOURS).pdf

    Discover more atwww.dk.comDuskScurry around the dunes with a fennec fox.Find out how a flock of ostriches beats the heat.MiddayDawnSlink through the sand with a desert monitor lizard.AfternoonJacket Images Front Alamy/David J Slater tl; Photolibrary.com/Ifa-Bilderteam Gmbh tll; Ardea/Clem Haagner tcl; FLPA/Michael Patricia Fogden/Minden tcr; Abdulrahman Alsirhan trr; Science Photo Library/Art Wolfe tr; Getty Images/Frans Lemmens b. Back Alamy/Eurekatl; FLPA/Franz Lanting tr; Ardea/Duncan Usher cl; Natural Visions/Jason Venus cr; Getty Images/Frans Lemmens c; Ardea/Ian Beames bl; Nature Picture Library/Vincent Munier br. Spine Getty Images/Hugh Sitton t; Nature Picture Library/Bernard Castelein ba.The desert is an amazing place, full of excitement and wonder. Come face to face with the incredible creatures that struggle and survive there every day.DesertDesert 24 HOURS 24 HOURSDesertAround the clock with the animals of the desert Watch dorcas gazelles eat their breakfast at dawn.24HOURSPrinted in China12.99USA17.99Canada 9 780756 6198485 1 2 9 9ISBN 0-7566-1984-Xflexpaper.studylead.comflexpaper.studylead.com24 HOURS Desertflexpaper.studylead.comFirst American Edition, 2006Published in the United States byDK Publishing, Inc.375 Hudson Street, New York, New York 1001406 07 08 09 10 10 9 8 7 6 5 4 3 2 1Copyright 2006 Dorling Kindersley LimitedAll rights reserved. No part of this publication may be reproduced, stored in a retri system, or transmitted in any or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the copyright owner. Published in Great Britain by Dorling Kindersley Limited.A Cataloging-in-Publication record for this book is available from the Library of Congress.ISBN-13 978-0-7566-1984-8ISBN-10 0-7566-1984-XColor reproduction by ICON, United KingdomPrinted and bound in China by L. Rex Printing Co. Ltd.Discover more atg119g119g119g46g100g107g46g99g111g109Written and edited by Elizabeth Haldane and Fleur StarDesigned by Mary Sandberg and Cathy ChessonDTP designer Almudena DazPicture researchers Julia Harris-Voss and Jo WaltonProduction Lucy Baker Jacket copywriter Adam PowleyJacket editor Mariza O’KeeffePublishing manager Susan LeonardConsultant Berny SbeWith thanks to Lisa Magloff for project developmentLONDON, NEW YORK, MUNICH, MELBOURNE, and DELHI600 amDawn What’s up at 10 am page 14Lounging lizards page 16Big birds page 18Little critters page 20Morning Welcome to the Sahara, Introduction page 4What’s up at 6 am page 6Breakfast bar page 8Graceful gazelles page 10The burrowers page 12A desert might look like a vast empty space, but there’s a lot of life among the sand and rocks. Spend 24 hours with some of the animals that live there and see how they survive in this dry, tough environment.1000 amflexpaper.studylead.comHuge stretches of desert that are covered with sand dunes are called sand seas, or ergs.600 pm 1000 pmWhat’s up at 2 pm page 22A plague of locusts page 24Feathered friends page 26Life at the oasis page 28AfternoonWhat’s up at 6 pm page 30Cross-country camel page 32Night stalkers page 34Venomous vipers page 36Dusk What’s up at 10 pm page 38Under the cat’s paw page 40Foxy feast page 42A sting in the tail page 44Glossary page 46Night in Africa, an arid desert the size of Europe. 200 pm310in25 cmofrainfallsinayear.Notmanyplants growthere.Adesertisaplace whereonlyflexpaper.studylead.comIn 24 Hours Desert we spend a whole day in the Sahara Desert looking at the creatures that live there. During the day we return to the animals featured below to see what they are up to.42400 hours Horned viperAlthough just 24 in 60 cm long, this snake has venom potent enough to kill a human being.At 3 ft 1 m tall, a dorcas is the smallest species of gazelle. All species of desert antelope have amazing ways of coping with the dry desert. Dorcas gazelleOnly 15 percent of the Sahara is sand. The rest is made of up rocks and gravel.flexpaper.studylead.comŽ ŽŽ ŽTime sequence boxes show you how quickly things can change in the desert, whether at the oasis or in the middle of dunes.802 amTime to change3Scale Look for scale guides as you read the book. Based on children 3 ft 9 in 115 cm tall, they will help you work out the size of the animals you meet.IntroductionThe 10 ft- 3 m- long camel dwarfs all other desert animals. Saharan camels are dromedaries, a species with one big hump.CamelThe temperature in a desert can hit extreme highs, typically in the middle of the day in summerbut it can also plummet beyond freezing during the winter nights. It is lack of water, however, that makes a desert, not extreme temperatures. The world’s smallest fox is just 13 in 33 cm long, but it has enormous ears The fox loses body heat through its ears, helping to keep itself cool in the daytime.Fennec foxThe 12 in- 30 cm- long common agama is also called the rainbow lizard because the males change color throughout the day.AgamaMinimum temperature14 F -10 C winter, nighttimeMaximum temperature136 F 58 C summer, daytimeflexpaper.studylead.comThe cold desert night comes to an end as the Sun rises over the sand dunes, bringing heat to the dry land. The daytime animals begin to stir; they need to get their food for the day before the desert gets too hot.6600 am The desert is quiet in the dawn chill, but in a few minutes it will be much busier.flexpaper.studylead.comAlready on the move, the camel has only had a few hours’ rest overnight. It can keep active for 24 hours at a time, but will need to rest afterward.A dozing, murky-colored agama sunbathes on a rock to raise its temperature. It needs to be warmed up before it becomes active.As the Sun’s rays heat the sand, the nocturnal horned viper finishes a night’s hunting and warms itself before heading for bed. Fennec fox cubs are settling down to sleep in their den. They have spent the night feeding from their mother while their father was hunting.In the morning the desert grasses and shrubs are heavy with dew. By grazing now, the dorcas gazelle takes in the moisture in the grass. What’s up at 6 o’clockflexpaper.studylead.comIt’s hard to find water in the dry desert. Grazing mammals get moisture from plants when there is no water around for drinking. The best time for eating is first thing in the morning, when the temperature is cool and the grass is wet with dew.8Many desert animals, not just mammals, feed in the morning, before it gets too hot. A darkling beetle tips its head down to drink the dew off its own back.Camels have built-in pantries. Their humps contain fat, which they feed off when food is sparse. But they really load up when they find water, drinking up to a quarter of their body weight at one time and storing it in their stomachs. Most of the Sahara’s grazing mammals live in herds, and sheep are no exception. They live in the north of the desert, where it is a little easier to find food in the cooler mountains.700 am flexpaper.studylead.comThe coat of an addax is white in the summer and turns brown in the winter.9A combination of being overhunted and lack of food due to drought nearly made the addax antelope extinct at one time. They are still very rare, but their numbers are growing. Toward the edge of the desert, a rare scimitar-horned oryx finds a rich area of grass. These migrant mammals live in the southern Sahara when the rains are due, and move south to find food when it’s dry.Breakfast barBoththemaleandfemaleaddaxhavelong,thin,spiralinghorns.flexpaper.studylead.comWhen startled, a dorcas calls through its nose to warn the herd. The call sounds like a duck quacking.Living in herds of up to 100 animals, dorcas gazelles cross huge distances of open desert to find food. They can go for months without drinking, getting all their water from plants. The lushest plants grow at the edges of the desert.10Both male and female dorcas gazelles have horns. Those of females are thin and straight, but the males’ curve backward and point up at the ends.800 amflexpaper.studylead.com11Graceful gazellesHead to head Male dorcas gazelles guard their territories fiercely, marking out areas with piles of dung and tussling with other males who overstep the mark. They also lock horns over potential mates. Females don’t fight.The smallest species of gazelle has the longest legs in relation to the size of its bodygreat for sprinting away from predatorsthegazelles runawayatspeedsof upto55mph90kph.Ifapredator strikestheherd,flexpaper.studylead.comLike most desert animals, the rodents are foraging for food before the day gets too hot, when they head off to their burrows under ground. Small animals heat up quickly in the hot sun and lose body water if they are not in the shade.Patrolling the desert skies, the golden eagle is a major predator of rodents, along with desert eagle owls and the rare Houbara bustards. Run, rodent, run The nocturnal jerboa is finishing a night’s foraging when it is disturbed by an eagle-eyed predator.Of the 22 species of rodent living in the Sahara, half are gerbils.Gerbils have excellent hearing, which they use to detect predators and also to find mates. Being so small in such a vast desert, it can be hard for gerbils to locate each other.909 am900 am 12WatchoutThere’sdangerflyingoverhead.flexpaper.studylead.com With a leap of its huge legs, the jerboa springs into action and bounds away from the eagle.Despite being just 4 in 12 cm long, the jerboa can leap up to 6 ft 2 m in one jump, taking it safely to its burrow in a matter of moments. Made itThe burrowersBy far the biggest living thing on this page is the euphorbia plant, which can grow up to 10 ft 3 m tall. The succulent plant takes in water when it rains and stores it in its leaves to survive dry periods.Just as a camel stores fat in its hump, the fat-tailed gerbil carries its reserves in its club-shaped tail. Like many rodents, these gerbils have scent glands on their stomachs and mark their territories by rubbing their stomachs on the ground.The jerboa’s name comes from the Arabic word yerbo, which means “big thighs.” The jerboa also has a tail longer than its body, which acts as a prop when it sits still.The jerboa will spend the rest of the day asleep.The hind legs are four times bigger than the front legs.The fat-tailed gerbil eats insects, which it routs out from the ground with its pointed snout.13910 am910 amflexpaper.studylead.com21 Desert shrub Commosum calligonumA sudden wind appears and parts of the desert become a sandstorm as the fine, dusty sand is blown everywhere. Some winds gradually blow themselves out, but others stop as abruptly as this one has arrived.1000 am 141flexpaper.studylead.comAlthough some distance away, the fennec fox is woken by the sandstorm. Keeping its ears flat, it picks up the sound of the swirling winds.The horned viper stays in its daytime bed, away from the sandstorm that could easily bury it. Its burrow was once made and occupied by a gerbil. Away from the storm, the agama continues sunbathing. As the reptile warms up, it changes color from brown to blue and red.The dorcas gazelle is caught unaware by the sandstorm. Sometimes hot air and lots of flies are blown in ahead of the storm, giving a warning.Too big to hide, the camel keeps the sand at bay by closing its nostrils. It has extralong eyelashes and a third eyelid to protect its eyes.What’s up at 10 o’clockflexpaper.studylead.comCold-blooded reptiles need to warm up before they start their day. They can stand the heat long after mammals have headed for shade, but will also take shelter when it gets too hot in summer.Agamas eat anything, from flowers to grasshoppers. This desert agama has wrestled with a scorpion, able to avoid its sting. But perhaps even more amazing is the agamas’ trick of eating flies, which they catch in midflight by jumping into the air.A chameleon searches for insects to eat, its eyes able to swivel in different directions as it slowly paces the desert. It is not disturbed by the hot sand under its feet, even though it is more used to living in trees. Its split feet are ideal for gripping branches.The monitor’s diet includes snakes and lizards even those of the same species.Desert monitorsarethe biggest reptiles in the Sahara.Theyswallow 161100 amflexpaper.studylead.com802 am802 am802 amWhile swimming for insects in the sand, the skink spies a predatory monitor lizard in the distance. Going, going, gone...A skink’s long, thin toes and pointed face are ideal tools for digging in the sand. The skink is also known as the sand fish because it moves around by swimming through the sand, hunting down insects found below the surface.Lounging lizardsWithout hesitation, the skink takes a dive into the sand. Scales cover its ears to stop them from filling with sand.Seconds later the skink is well hidden, although it keeps a wary eye out for the danger to pass.Common agamas inhabit rocky areas, rather than the hot dunes. They live in small groups, but it is easy to spot the leader he’s the brightly colored male among the brown females.Desert monitors hibernate during the winter in shallow burrows that are not much bigger than themselves. They also burrow to avoid the strong summer sun around midday. If they get too hot, they die.theirpreywhole.171101 am1101 am1102 amflexpaper.studylead.com2Who needs to flyOstriches cannot fly, but they are the fastest animals on two legs, reaching speeds of 45 mph 70 kph for 30 minutes at a time. Should a predator catch one, it will receive a nasty kick from the powerful bird.At one time, ostriches lived in the wild in the Sahara. Now they live in the Sahel, the semidesert just south of the Sahara. It is a sign that the dry desert is spreading. Spying a predator, an ostrich bends its neck to disguise itself. From a distance, the curled-up ostrich looks like a tree.Midday18flexpaper.studylead.com1230 pm40 daysLaying all their eggs in one basketBig birdsOstriches are herd animals, but they do not just stick to their own kind. They often graze alongside herds of antelopes.One ostrich egg is equivalent to 24 chicken eggsa good meal for predators such as this Egyptian vulture. The bird throws stones at the egg to smash its shell.Ostriches are not just record-breaking runners; they are also the world’s biggest and heaviest birds. They also lay the largest eggs, around 7 in 18 cm long.A female ostrich guards her eggs in a shared nest. The male takes over at night, sitting on the clutch of 40–50 eggs.The chicks begin to hatch. Only half the eggs will have survived to bear chicks.The chicks are already 1 ft 30 cm tall at birth. Within a mo

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