My creature Bobthegreat http://194.80.29.14/cgi-bin/info.exe?id=2436958
is currently being reported as the largest creature, and the greediest carvivore. And at only 1.33 years old there is a chance he will continue to grow and eat for a little while longer.
Unfortunately, he was too busy hunting and eating to have many children, and it looks quite likely his line will die out after him, as his only surviving son has a food gauge of .01