Animals 14
Nature of Science:An Amazon Discovery 14
Chapter 1 Sponges,Cnidarians,and Worms 18
1 What Is an Animal? 20
2 Integrating Mathematics:Symmetry 27
3 Sponges and Cnidarians 32
4 Worms 39
Chapter 2 Mollusks,Arthropods,and Echinoderms 50
1 Mollusks 52
2 Arthropods 58
3 Insects 66
4 Integrating Physics:The Sounds of Insects 74
5 Echinoderms 77
Chapter 3 Fishes,Amphibians,and Reptiles 84
1 What Is a Vertebrate? 86
2 Fishes 91
3 Amphibians 99
4 Reptiles 105
5 Integrating Earth Science:Vertebrate History in Rocks 115
Chapter 4 Birds and Mammals 122
1 Birds 124
2 Integrating Physics:The Physics of Bird Flight 134
3 What Is a Mammal? 137
4 Diversity of Mammals 145
Chapter 5 Animal Behavior 154
1 Why Do Animals Behave as They Do? 156
2 Patterns of Behavior 164
3 Integrating Chemistry:The Chemistry of Communication 174
Interdisciplinary Exploration:The Secret of Silk 180
Reference Section 188
Skills Handbook 188
Think Like a Scientist 188
Making Measurements 190
Conducting a Scientific Investigation 192
Thinking Critically 194
Organizing Information 196
Creating Data Tables and Graphs 198
Appendix A:Laboratory Safety 201
Glossary 204
Index 207
Acknowledgments 212
Inquiry Activities 19
CHAPTER PROJECT 19
Opportunities for long-term inquiryChapter 1：Alive and Well 19
Chapter 2：Going Through Changes 51
Chapter 3：Animal Adaptations 85
Chapter 4：Bird Watch 123
Chapter 5：Learning New Tricks 155
DISCOVER 20
Exploration and inquiry before readingIs It an Animal? 20
How Many Ways Can You Fold It? 27
How Do Natural and Synthetic Sponges Compare? 32
What Can You Learn About a Flatworm by Looking at It? 39
How Can You Classify Shells? 52
Will It Bend and Move? 58
What Kinds of Appendages Do Insects Have? 66
What Causes Sound? 74
How Do Sea Stars Hold On? 77
How Is an Umbrella Like a Skeleton? 86
How Does Water Flow Over a Fish's Gills? 91
What's the Advantage of Being Green? 99
How Do Snakes Feed? 105
What Can You Tell From an Imprint? 115
What Are Feathers Like? 124
What Lifts Airplanes and Birds Into the Air? 134
What Are Mammals' Teeth Like? 137
How Is a Thumb Useful? 145
What Can You Observe About a Vertebrate's Behavior? 156
What Can You Express Without Words? 164
Can You Match the Scents? 174
Sharlpen Your SKills 24
Practice of specific science inquiry skillsInferring 24
Observing 44
Classifying 54
Graphing 68
Communicating 92
Drawing Conclusions 113
Classifying 141
Predicting 158
Reinforcement of key concepts 22
Get Moving 22
Hydra Doing? 36
Pill Bugs—Wet or Dry? 62
Tune In 75
Bead-y Bones 88
Webbing Through Water 102
Eggs-amination 131
It's Plane to See 135
Insulated Mammals 139
Line Them Up 161
Worker Bees 167
Skills Lab 46
In-depth practice of inquiry skillsEarthworm Responses 46
A Snail's Pace 57
Soaking Up Those Rays 110
Looking at an Owl's Leftovers 128
Become a Learning Detective 163
Real-World Lab 30
Everyday application of science conceptsA Tale Told By Tracks 30
What's Living in the Soil? 72
Home Sweet Home 98
Keeping Warm 143
One for All 172
Interdisciplinary Activities 116
Science and History 116
Discovering Vertebrate Fossils 116
Science and Society 38
Coral Reefs in Danger 38
Animals and Medical Research 144
Connection 34
Language Arts 34
Social Studies 70
Language Arts 101
Visual Arts 125
Social Studies 170
EXPLORING 33
Visual exploration of concepts 33
A Sponge 33
The Life Cycle of a Dog Tapeworm 41
A Snail 55
A Crayfish 63
Insect Metamorphosis 69
A Sea Star 79
A Bony Fish 95
A Frog 103
A Lizard 108
A Bird 127
Birds 132
Placental Mammals 148
A Honeybee Society 169