When Jack and Annie came back from their adventure in Magic Tree House #33: Narwhal on a Sunny Night, they had lots of questions. What is a narwhal? Why is it nicknamed the unicorn of the sea? What other whales live in the arctic? How do they survive the cold? Find out the answers to these questions and more as Jack and Annie track the facts about narwhals and other whales. Filled with up-to-date information, photographs, illustrations, and fun tidbits...

Born deep in the ocean, Kelp is not like the other narwhals and one day, when he spies a creature on land that looks like him, he learns why.

"As winter comes to an end, a pod of narwhals begins a treacherous journey north. Along the way, they must find fish to eat, avoid a hungry polar bear, and navigate a maze of sea ice. Will their sensitive long spiral tusks and clicking calls be enough to keep them safe and help them find their way to their summer resting grounds? Discover the mysteries of these amazing toothed whales and their Arctic home in this suspenseful narrative about the majestic...

When graffiti starts appearing on buildings all over Aquamarina, Violet and Wally follow the clues to find the culprit! In Book 3 of the series, join the Undersea Mystery Club as they explore the ocean to help their aquatic friends! It's the first day of school, and Violet can't wait to see all of her friends. But after a mysterious blob of paint appears on the school building, Violet and her best friend Wally get to work looking for clues. Soon,...

After Violet and Wally find an old treasure chest hidden in a cavern, they manage to open the rusty lock and discover little-known facts about the history of the nearby town.

Narwhal enjoys his big, yellow blanket as a source of warmth and comfort as well as for its ability to become an object of the imagination and a great picnic cloth for sharing time with his best friend, Jelly.

"If you could have any animal's superpower, whose would you choose?"--

This time, meet famous explorer Leif Erikson and help save a narwhal! When the magic tree house whisks Jack and Annie to Greenland, they're not sure what time they've landed in, but they immediately know what their mission is: save a narwhal! Then, they meet a young hunter named Leif Erikson, and they ask for his help. But Leif has other ideas.

"Una magnífica serie para que los pequeños empiecen a ser lectores autónomos. Narval es un narval despreocupado. Medu es una medusa sensata. Puede que no tengan mucho en común, pero a los dos les encantan los gofres, las fiestas y las aventuras. Únete a Narval y Medu, y descubre el gran océano con ellos y su pandilla."--Publisher's description.

When pieces of equipment start disappearing from the new Aquamarina playground, it's up to Violet the mermaid and her best friend Wally the narwhal to solve the mystery. Back matter includes ocean science and civil engineering facts.