News in Brief Animals Ocean animals have bulked up since ancient eras Size of marine creatures averages 150 times bigger than 540 million years ago LARGE AND IN CHARGE Marine animals today have become 150 times larger on average than the biggest ocean dwellers in ancient times. The blue whale is the biggest animal to have ever lived. NOAA Photo Library/Wikimedia Commons Share this:EmailFacebookTwitterPinterestPocketRedditPrint By Kate Baggaley February 19, 2015 at 3:00 pm Marine animals have become much bigger over time, scientists report February 20 in Science.