Bullfrog Books

In Rocks, beginning readers will learn to identify different kinds of igneous, metamorphic, and sedimentary rocks. Photos and carefully leveled text provide defining details for each kind,… More →

In Blue Jays, beginning readers will learn how these birds survive winter, find food, build nests, and raise their young. Vibrant, full-color photos and carefully leveled text will engage… More →

In Seashells, beginning readers will learn to identify different kinds of seashells found on the beach. Photos and carefully leveled text provide defining details for each kind, such shape,… More →

In Slimy Animals, readers will learn about slimy animals, including snails and slugs, slime eels, and worms. A comprehensive Why Are Some Animals Slimy? back matter feature highlights… More →

Record-Breaking Animals introduces beginning readers to the biggest, smallest, fastest, slowest, smartest, and strongest creatures in the animal kingdom. Learn about the impressive feats of a More →

What's slower than a sloth? Could you beat a tortoise in a race? What's the slowest swimmer? In Slowest Animals, beginning readers are introduced to the slowest animals across a variety of… More →

Owls hunt at night. Hummingbirds can fly backward. We recognize cardinals and blue jays by their bright colors. North American Birds introduces readers to many common bird species across the… More →

What animals use tools? How do orcas work together to hunt? Can elephants tell when a friend is sad? In Smartest Animals, beginning readers are introduced to the smartest animals across a… More →

How much weight can an elephant carry? What animal has the strongest bite? In Strongest Animals, beginning readers are introduced to the strongest animals across a variety of classes and… More →

In Bald Eagles, beginning readers will learn how these birds of prey fly to find food and the physical features that help them hunt. Vibrant, full-color photos and carefully leveled text will More →

In Leaves, beginning readers will learn to identify different kinds of plants and trees by their leaves. Photos, labels, and carefully leveled text provide defining details for each leaf. More →

In Gross Animal Eaters, readers will learn about different bizarre animal diets, including dung eaters, blood drinkers, and body-munching parasites. A comprehensive Gross Animal Foods… More →