In 1831 a 22-year-old naturalist named Charles Darwin stepped aboard the HMS Beagle as a traveling companion of an equally youthful sea captain called Robert FitzRoy. The Beagle's round-the-world surveying journey lasted five long years on the high seas. The young Darwin noticed everything, and proved himself an avid and detailed chronicler of daily events on the Beagle and onshore. What Darwin Saw takes young readers back...