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The early ancestors of 100-foot-long blue whales were dolphin-sized, according to new research that explains how, when, and why these and other whale giants got to be so big.... +
Credit: Courtesy of Hugh Pearson and David Reichert, Silverback Films/BBCGigantism seems like a past phenomenon, given that enormous animals such as Megalodon and Tyrannosaurus rex died out millions of years ago. The largest vertebrate that has ever l...