Artists impression of Argentinosaurus a titanosaur Shutterstock/David RolandTitanosaur dinosaurs, thought to be the largest vertebrate animals to have ever walked on Earth, were found on every continent. They might have been hungry when they built nests or laid eggs.La Leuzinger, a researcher at the University of Buenos Aires, Argentina, and her colleagues examined stable carbon and oxygen isotopes within 71 titanosaur eggsshells and a tooth. All three nesting sites were fossilized in Argentina. These fossils range in age from 66 million to 100 million years.Carbon is found in food and water.
