Blue Whale – The Largest Animal Ever Existed! The blue whale (Balaenoptera musculus) is a marine well evolved creature having a place with the baleen whales (Mysticeti).[3] At up to 30 meters (98 ft)[4][5] long and with a most extreme recorded weight of 173 tons (191 short tons)[5][6] and presumably coming to more than 181 tons (200 short tons), it is the biggest creature known to have ever existed.[7][8] Long and slim, the blue whale’s body can be different shades of pale blue dark dorsally and to some degree lighter…