As children, many of us learn about the wondrous process by which a caterpillar morphs into a butterfly. The story usually begins with a very hungry caterpillar hatching from an egg.
The Largest Animal Ever: The Blue Whale. The blue whale (Balaenoptera musculus) is a marine mammal belonging to the suborder of baleen whales. At 30 metres (98 ft) in length and 180 metric tons (200 short tons) or more in weight, it is the largest known animal to have ever existed.
The largest of all known animals, the blue whale attains a maximum length and weight of about 30 meters (100 feet) and 150 tons; the largest known individual, a female 33.58 meters (110.14 feet) in length, was reported in 1922.. metric tons. Blue Whale. Whale and Dolphin Conservative Society.