Readers will learn just how amazing sea urchins can be. The many species of this ocean invertebrate may not look like other undersea animals, but they have some amazing adaptations and behaviors that help them survive. Without faces, limbs, bones, blood, or a brain, sea urchins have incredible ways eating, moving, reproducing, and defending themselves.

The parts of a plant that grow below are just as important as what's above ground. Readers will learn about the world of roots, bulbs, and tubers, as well as other organisms that grow underground. Readers will also discover why the things that grow underground are an important part of the Earth.

Oceanic whitetip sharks are unique for their long, whitetipped fins and their fierce hunting skills. Find out what makes this shark such a bold predator.

All sorts of interesting creepy crawlies live in underground habitats. Readers will love learning about the bugs, spiders, grubs, and earthworms that lurk below. Young readers will uncover the features of the animals' underground habitats and disover the important roles the creatures play in the ecosystem.

Blood sucking bed bugs, bats, and birds. Readers will learn about creatures all over the world that love to binge on blood. These disgusting diets and other interesting facts will make readers say, eww, gross!

Wrasses that can change from female to male! Anglerfish that glow under the sea! Some fish have found extreme ways to adapt to their environments. Discover some of the most interesting and unusual adaptations in fish that have allowed them to survive all over the world.

Did you know that some animals use poop to cool off? It's true. And there's even an animal that uses poop to defend itself! Learn more about the gross things animals do and why they do them. The zoo will never be the same!

The second brightest object in the sky, after the moon is Venus. It's also the only planet named after a woman. Learn more about bright, beautiful Venus, named for the Roman goddess of love and beauty.

The smallest planet in our solar system is also the closest to the sun. That means on Mercury, one year is just 88 days long! Discover more facts about the small but mighty Mercury.

The only planet to support life, Earth has a lot going for it. Think you know everything there is to know about our home planet? Think again. Discover more about the blue planet we call home.

Mars is famous for its coloring, but the fourth planet from the sun has more than that going for it. Discover more interesting facts and secrets about the famous "red planet."

From shrews to snakes, all sorts of animals burrow in complex homes below the surface of the Earth. Readers will uncover the many different creatures that find the underground to be an ideal habitat. There’s a whole world beneath the ground!