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Amphibians are known for their soft, moist skin. Unlike many other animals, they are able to breathe through this skin. Learn more in Amphibians, an Animal Kingdom book.

Mutualism is a relationship between two animals where both benefit. Aphids create food for ants, and ants protect aphids from predators such as ladybugs. Learn more in Symbiosis.

As a tadpole changes into a frog, its tail is absorbed into its body. A caterpillar can eat up to 27, 000 times its weight in food before becoming a butterfly. Learn more in Metamorphosis.

The most common type of camouflage is background matching. The coat of an arctic fox changes over the year to match its surroundings. Learn more in Camouflage.

Reptiles are found on every continent except Antarctica. As cold-blooded animals, they cannot live in the coldest parts of the world. Learn more in Reptiles, an Animal Kingdom book.

Accompanying interactive ebook available.

The strongest hurricanes can have winds of more than 157 miles (252 kilometers) per hour. The widest hurricane ever was more than 1, 380 miles (2, 220 km) across. Learn more in Hurricanes, one of the titles in the Forces of Nature series.

Did you know that some frog species can lay up to 20, 000 eggs in a single season? Most amphibians lay their eggs under or near water. Discover more fascinating facts in Amphibians, a Life Cycles book.

Did you know that reptiles are some of the longest-living animals on the planet? Large tortoises such as the Aldabra tortoise can live for more than 150 years, while alligators can live up to 70 years. Discover more fascinating facts in Reptiles, a Life Cycles book.

Explores how symbiosis has helped animals adapt to survive a variety of conditions and climates.

Did you know that animals with feathers use different camouflage tactics than animals with fur? A species camouflage also depends on the behavior of its predators. Discover these and other intriguing facts in Camouflage, an Animal Adaptations book.

Did you know that monarch butterflies start their lives as eggs? They go through four separate stages during their life cycle. Learn these and more compelling facts in Metamorphosis, an Animal Adaptations book.

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Introduces hurricanes, describing how they form, where they occur, what causes them to increase in strength, how they are measured, and the types of damage they cause.

Earthquakes are one of the deadliest natural disasters in the world. Although earthquakes cannot be prevented, it is possible to predict when and where an earthquake will occur. Learn more about this fascinating phenomenon in Earthquakes. This is an AV2 media enhanced book. A unique book code printed on page 2 unlocks multimedia content. This book comes alive with video, audio, weblinks, slide shows, activities, hands-on experiments, and much ...

Did you know humpback whales have lungs and need to reach the ocean surface in order to breathe? The humpback whale turns off half of its brain in order to sleep, while the other half stays awake to control the whale's breathing. Discover more about this intriguing underwater dweller in [this book]"--

During the expansion west and amid the increasing population of the United States, the nation underwent several key changes in its government. Reforming the Government: 1813-1860 recounts these changes and the forces that played a role in causing them. It includes the presidency of Andrew Jackson and the technological and political changes that swept the nation, resulting in a new-look United States.

The American Civil War was the sternest test yet for the young nation. The Civil War: 1856-1865 recounts the years of the conflict and how it impacted the development of the American nation. It includes the underlying causes, key events, and results of the Civil War, such as the emancipation of the slaves.

Did you know that reptiles are some of the longest-living animals on the planet? Large tortoises such as the Aldabra tortoise can live for more than 150 years, while alligators can live up to 70 years. Discover more fascinating facts in Reptiles, a Life Cycles book.

Did you know that some frog species can lay up to 20, 000 eggs in a single season? Most amphibians lay their eggs under or near water. Discover more fascinating facts in Amphibians, a Life Cycles book.