Quote Originally Posted by andruejaysin
Blue whales are the largest animal which ever lived on earth. Giant squid are not even in the running, sperm (LOL) whales fed on little else. It's dolphins that kill sharks by ramming them, not killer whales.
erm... ever heard of gigantosaur? (wouldn't suprise me if you hadn't... it was just recently discovered in the last 10-20 years or so... but dwarfed even t-rex)

then of course there were brantosaurs and their near relatives...

and those are just in the 'dinosaur' period (triassic?) there have been even larger animals...