What’s the largest animal ever to live on planet Earth? Whether you’re measuring in double decker buses, swimming pools or African elephants, any budding naturalist will be able to tell you that the answer is the blue whale. At 31 metres long and weighing 146 tonnes, this enormous cetacean easily exceeds the paltry dimensions of such pretenders as diplodocus and Tyrannosaurus rex. In London’s Natural History Museum, one of the rare institutions where life-sized models of both animals exist side-by-side, the blue whale has a good three metres on Dippy the beloved Diplodocus.
The blue whale has had to fend off another challenger this week, in the form of Dreadnaughtus schrani, a behemoth from 77 million years ago thought to measure 26m from tip to tip. Dreadnaughtus has made headlines as the most complete sauropod skeleton ever discovered, a body of evidence which provides ample confirmation of its titanic size.
But the absence of such complete remains has never stood in the way of scientists looking to predict an animal’s length and height. The dimensions of the largest dinosaurs have often been extrapolated from just a few fragments of their enormous skeletons. In one notable case, the discovery of a single vertebra led to the prediction of an entirely new species of dinosaur, larger than any that had come before or since. A dinosaur that would make the blue whale look like small fry: Amphicoelias fragillimus.