The biggest animal in the world is the blue whale (Balaenoptera musculus). The blue whale has 30 meters (98 ft) in length and over 180 metric tons (200 short tons) in weight.
The blue whale is the largest known animal ever to have existed. The heaviest blue whale ever recorded weighed 190 metric tons (210 short tons). The longest blue whale ever recorded was female measuring 33.6 meters (110 ft)