Rob and his best friend Phoebe set out to find what's been killing pets in their Colorado mountain town. What they find is The Last Synapsid, a squat dinosaur-like creature who claims he's wandered into a time snag from his own era, 30 million years before the dinosaurs.

The Last Synapsid 2011, Yearling Books

ISBN-13: 9780440422686

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The Last Synapsid 2009, Delacorte Press, New York, NY

ISBN-13: 9780385735810

Hardcover

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The Last Synapsid 2009, Delacorte Press, New York, NY

ISBN-13: 9780385905671

Hardcover

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