Alexander Kellner, left, a researcher with the Brazilian National Museum, and Argentine paleontologists Jorge Calvo, center, and Juan Porfiri, display parts of a skeleton of what could be a new dinosaur species, a 105-foot plant-eater, Futalognkosaurus dukei dinosaur, during a news conference in Rio de Janeiro, Monday, Oct. 15, 2007. The Patagonian dinosaur was uncovered on the banks of Lake Barreales in the Argentine province of Neuquen and according with the scientists the giant herbivore walked the Earth some 88 million years ago, during the late Cretaceous period. (AP Photo/Ricardo Morales)
