Are Unicorns Real?By: Ginjer L. Clarke Series: Penguin Young Readers, Level 4 Learn about the history of unicorns in this photographic nonfiction leveled reader perfect for kids interested in the natural and unnatural world! Did you know that the Siberian unicorn roamed the Earth during the last Ice Age? Or that technically any creature with one horn is considered a unicorn? That means narwhals, certain antelope, and even shrimp with a horn can be called unicorns!