"If I Built a Zoo" is a children's book written by Chris Van Dusen. The story follows a young boy named Marty who imagines creating his own zoo filled with unique and fantastical animals. He envisions a place where the animals can live in exciting habitats and interact with visitors in fun ways. Throughout the book, Marty describes various imaginative creatures, such as penguins that fly and monkeys that can talk. The illustrations are vibrant and colorful, bringing Marty's dream zoo to life. The story encourages creativity and showcases the joy of imagination in building a world of wonder.