Level Pre-Reader: Early Reader Age Range: 3 - 5 years Grade Level: Preschool Language: English Pre-Reader books are great for kids just beginning to read with help. ABOUT WILDLIFE TREE edZOOcation™ READERS WILDLIFE TREE edZOOcation™ READERS inspires a love for animals through reading. Zookeeper Readers (Pre-Reader) books use pictures and familiar ideas to teach simple scientific concepts to kids just beginning to read with help.