Like plenty of Texas spring breakers, LeeBeth opted for a trip to the beaches of South Padre Island in recent weeks. But while the sun, the sand, and the promise of a fat margarita might have drawn others, LeeBeth was driven by something else entirely: an ancient animal instinct still scarcely understood by scientists. LeeBeth is a shark—of the great and white variety—whose more than two-thousand-mile trip to the Gulf of Mexico earned her the spotlight this month, in part because of the sheer length of her journey, but also because a great white shark had never been tracked that far west. Megan Winton, a research scientist with the Atlantic White Shark Conservancy, says that when it comes to tracking sharks, LeeBeth, who clocks in at…