A quick doodle of Argentinosaurus, a major contender for the title of largest dinosaur (and largest terrestrial animal) known. A member of the titanosaurian sauropod lineage, this giant would have roamed the savannas of South America between 96 and 92 million years ago, during the Cretaceous Period. It may have weighed over 110 tons and ran as long from head to tail as 130 feet.