Track the facts about the unicorn of the sea--the narwhal--and its closest relatives! When Jack and Annie came back from their adventure in Magic Tree House #33

Among all the large whales on Earth, the most unusual and least studied is the narwhal, the northernmost whale on the planet and the one most threatened by glob

The #1 bestselling Magic Tree House series is ready to whisk you away with Jack and Annie! This time, meet famous explorer Leif Erikson and help save a narwhal!

Why do these whales live where no others can? How do they keep warm in subzero water temperatures? How do they navigate and communicate under the ice? Biologist

Track the facts about the unicorn of the sea--the narwhal--and its closest relatives! When Jack and Annie came back from their adventure in Magic Tree House #33