Ever since the first youngster in history had a pet, cats vs. dogs has been a hotly debated issue at recesses and lunch tables worldwide. Which one's better? Smarter?

Introduces the migration patterns of monarch butterfies, describing the vast distances they cover, why they migrate, and the dangers they face along the way.

Uses a submarine trip to the bottom of the sea to introduce various deep-sea creatures, including the angler fish, octopus, and sperm whale.

In rhyming verse, bacteria describe how they live in the mouth and cause plaque, cavities, and other problems.

Simple text and photographs depict the physical characteristics, behavior, and habitats of different kinds of bats, as well as various myths about this flying mammal.

Simple text and photographs present the physical characteristics, behavior, and habitat of a variety of animals living near the North and South Poles, including humpback whales, seals, polar bears, and penguins.

A simple explanation of what sharks look like, how they hunt, what they eat, and how they are born.

An introduction to the big cats including lions, tigers, cheetahs, jaguars, and leopards.