TRAVEL THROUGH THE AMAZING WORLD OF WILD ANIMALS Our planet is home to more than 8 million different types of animals! From tiny hummingbirds to the gigantic blue whale. Travel by land, sea, and air to discover the world of animals.Educational content made fun! Factivity is a series of interactive, fully-illustrated reference/activity books, where educational content is cleverly integrated with on-the-page puzzles and activities to engage young readers.