Before humans ruled the world, planet Earth was a land of giants. But of all the beasts that ever lived…which is the biggest? Now experts take us on a journey to uncover the top ten largest of their kind. From bugs the size of hawks, to snakes the size of buses, to sharks that could bite a truck in half, we count down from ten. We investigate the latest discoveries, explore remote sites and follow the science behind the mind-blowing size of these creatures. And using photo-real CGI and dramatic demonstrations we reveal the true scale and awesome abilities of these creatures.