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Every year in Namibia, about two thousand zebras suddenly disappear from their grazing area along the Chobe River. Months later, the herd returns. Where do they go? And why? Thanks to satellite-tracking collars, scientists were able to solve the mystery, but several questions remain. Award-winning science author Sandra Markle reveals the process scientists used to study the zebras, and she also delves into the science of migration, exploring how animals know where to go, how to get there, and when to leave.



About the Author

Sandra Markle

SANDRA MARKLESandra Markle is the author of more than 200 books for children, such as A Mother's Journey (Charlesbridge, 2006) , How Many Baby Pandas (Walker, 2009) , The Case of the Vanishing Golden Frogs (Millbrook, 2011) , Butterfly Tree (Peachtree Publishing, 2011) . She has won numerous awards for this work, including Boston Globe-Horn Book Honor Book, Cooperative Children's Book Center Choices, NSTA Outstanding Science Trade Book, SB& F finalist, John Burroughs List of Nature Books for Young Readers, Junior Library Guild Selection, Orbis Pictus Recommended Book, Charlotte Zolotow Award, and MORE. She was honoured with the title of "Best of Children's Non-Fiction" Georgia Author Of The Year award five times and was named one of 1999's Women of the Year by Women in Technology International for her contributions to science and technology.In addition to her books, Sandra Markle has developed science specials for CNN and PBS. She is also noted for developing On-Line Expedition: Antarctica, one of the first on-line educational programs and continued adding further on-line reports from Antarctica while working on book projects in 1996 and 1999 as a grantee for the National Science Foundation's Artists and Writers Program.Reviewers have heaped praise on Markle's books, including:Outside and Inside Bats "The author presents a particularly felicitous accord of words and pictures in an outstanding science book for the primary grades." The Horn Book MagazineOutside and Inside Alligators "This newest installment of the Outside and Inside series adds another fine book to a top-notch series." Bookselling This Week, a Kid's Pick of the ListsOutside and Inside Dinosaurs It's like sitting down with a dinosaur expert who happens to be a great teacher." The Horn Book MagazineSandra Markle remains proudest, though, of the praise she has received in fan mail from children. She's happy to fulfill the requests of the young readers that urge her to "please write more."



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