When you think of enormous living things, you might think of a giraffe, an elephant, a hundred-foot blue whale, or that terrifying bug you just saw that really shouldn’t be so big. But in fact, the largest living organism, if we’re measuring by volume, is a tree. Specifically, it’s the General Sherman Tree in California’s Sequoia National Park, an hour and a half drive from Fresno. At 275 feet tall, the General Sherman Tree is as tall as three blue whales are long. It’s just thirty feet shorter than the…