Grades 2 - 5

Some animals lead a double life. First, they pose as aquatic creatures, breathing through gills and using tails to maneuver underwater. Then they exchange these features for legs and lungs to More →

Members of the insect class often get a bad rap. People swat at them, stomp on them, and go to great lengths to repel them. Though some insects are pests that spread disease, many are… More →

Compare a hummingbird and an ostrich; the differences are striking! One is tiny and hovers in the air like a helicopter. The other is massive and stays grounded, sprinting rather than flying. More →

Underwater, a large, lively community of unique animals thrives. Many of these animals belong to the fish class. There are colorful clownfish, lurking sharks, and silly sea horses. There are… More →

The largest animal alive is a mammal. It's the 150-ton blue whale. This whale is not only large but also loud—louder than a jet engine! Turn the pages of this book to learn about the… More →

Dinosaurs, the world's most notorious reptiles, became extinct a long time ago. However, their cold-blooded, scaly reptile relatives still creep around today. While people no longer have to… More →

For over 200 years, the United States Army has been one of the most powerful armies in the world. Responsible for all land-based operations, the Army uses a variety of vehicles and troops to… More →

Wealthy ancient Romans got their kicks at the arena, where convicted criminals, slaves, and prisoners of war were pitted against each other in physical combat. The contenders were called… More →

Goldfish are the most common type of pet fish. Though having a reputation as simple pets, fish do require a fair amount of attention. When you learn what your fish needs in its tank, how to… More →

It is estimated that there are currently 400 million dogs in the world. Many people keep these energetic, loving animals as pets and enjoy taking them on walks or playing fetch with them in… More →

Cats are the most popular house pets in the world. Discover why humans love the companionship of these playful, though sometimes moody, creatures. Learn what cats need in their daily lives… More →

In the wild, hamsters dig extensive tunnels that can go as deep as three feet into the ground! You can make your hamster’s cage fun and comfortable by putting plastic tunnels in it and… More →