Bullfrog Books

A large reptile soars through the sky. What is this creature? It is a pterosaur! In Pterosaur, readers learn all about this reptile's appearance, behavior, and how it survived in the time of… More →

In Mustang Horses, beginning readers will learn about the physical features, characteristics, and common duties of mustang horses. Vibrant, full-color photos and carefully leveled text will… More →

A dinosaur defends itself with three sharp horns and a frill. What is this creature? It is a triceratops! In Triceratops, readers learn all about this dinosaur's appearance, behavior, and how More →

In American Paint Horses, beginning readers will learn about the physical features, characteristics, and common duties of American paint horses. Vibrant, full-color photos and carefully… More →

Dinosaurs and ancient reptiles lived millions of years ago, but readers get a firsthand look at them in Dinosaur World! Engaging, story-driven narratives captivate and educate readers about… More →

In Thoroughbred Horses, beginning readers will learn about the physical features, characteristics, and common duties of thoroughbred horses. Vibrant, full-color photos and carefully leveled… More →

In Arabian Horses, beginning readers will learn about the physical features, characteristics, and common duties of Arabian horses. Vibrant, full-color photos and carefully leveled text will… More →

Did you know some Corvettes race? Or that they're made in Kentucky? In Corvette, beginning readers learn about this car brand, when and where the cars were first made, what its logo… More →

What is density? How does it affect whether an object sinks or floats? In Density, beginning readers learn how particles play a role in comparing the density of different objects. Vibrant,… More →

What is mass? How can we measure it? In Mass, beginning readers learn about mass and matter and how they apply to their everyday lives. Vibrant, full-color photos and simple diagrams… More →

Did you know that many Ferraris are red? Do you know what the Ferrari logo is? In Ferrari, beginning readers learn about this car brand, when and where the cars were first made, what its logo More →

A massive marine reptile lifts its head from the dark water. What is this creature? It is a plesiosaur! In Plesiosaur, readers learn all about this reptile's appearance, behavior, and how it… More →