Did You Know? PenguinsAn attractive and fun book, Did You Know? Penguins is packed with fascinating facts about the ever popular subject of penguins. Unique, endearing, and mysterious, penguins capture the imaginations of humans. For example, did you know there are eighteen different species of penguins in the world? As well as living in icy Antarctica, some penguins can also be found in warm tropical seas. Their adaptations to help them swim underwater are amazing. Each