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Donald M. Silver is the author of more than 40 science books for children and teachers alike. In addition to the award-winning One Small Square®series, he has written The Animal World, Why Save the Rain Forest?, Extinction Is Forever, and The Dinosaur Activity Book—all illustrated by Patricia J. Wynne.Patricia J. Wynne’s illustrations have also appeared in Scientific American, Natural History, and The New York Times as well as in the highly praised books Hungry, Hungry Sharks, and The Human Body. Both the author and illustrator live in New York City.