BEVERLY AND DERECK JOUBERT are award-winning filmmakers from Botswana and Explorers-in-Residence for National Geographic. Their work includes numerous documentary films, books, scientific papers, and many articles for National Geographic magazine. SUZANNE ZIMBLER has spent more than a decade creating resources for teachers and writing and editing nonfiction content for kids. Prior to working in publishing, she taught fifth and sixth grade in New York City public and charter schools.