This proved to be the biggest fish we landed that night, a 17-pound female. But that wasn't the end of the evening adventure. There are feral bulls in this part of Argentina (you read that right . . . bulls). As we walked out of the river and through the forest, Alex and I could hear stomping and bellowing in the near distance. We flipped on our headlamps, then saw the shadow of a 2000-pound beast splitting through the trees. "I think we'd better stay near the river," he said. "Claro que si . . . of course," I answered.