"Being massive can have its advantages, but brings equally immense challenges to survive--big bodies need more fuel, more space, and can attract unwanted attention. Take the world's largest lizard, the Komodo dragon, whose huge appetite means it must take on prey ten times its weight, or the tallest of them all, the giraffe, who with such a long neck must control immense blood pressure. From the 150-ton blue whale who can suck up four tons of krill...