Bullfrog Books

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 →

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 Cardinals, beginning readers will learn how these bright red birds defend their nest, find food, build nests, and raise their young. Vibrant, full-color photos and carefully leveled text… More →

What reptile fits on your fingertip? What animal might you need a microscope to see? In Smallest Animals, beginning readers are introduced to the tiniest animals across a variety of classes… 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 →

What's the biggest bird? Is a blue whale bigger than an elephant? What's the tallest animal? In Biggest Animals, beginning readers are introduced to the largest animals across a variety of… More →

In Owls, 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 engage 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 →

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's the biggest bird? Is a blue whale bigger than an elephant? What's the tallest animal? In Biggest Animals, beginning readers are introduced to the largest animals across a variety of… 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 →