 This one turned up dead, and in fact, no live sightings have ever been recorded. The roughly 15-foot-long creature kind of looks like a big dolphin. This would be the first specimen found in a place that would allow scientists to dissect it, though, giving them a chance to learn some valuable information about this mysterious creature. Fans at baseball's Home Run Derby in Arlington, Texas, were paying attention to a different kind of pitch last night.