Scientists tracking female oceanic whitetip sharks say they have been staying close to protected waters in the Bahamas, a good sign for conservationists fearing the species' demise. The shark is prized for its fins, which are used for soup, and is critically endangered in the Atlantic. Scientists published details of their tracking study in the journal PLoS ONE. "It's a key question for conservation," said a biologist not involved in the study. "It really makes a big difference whether there are parts of the population that are in protected areas."