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.
1 The blue whale is the largest of all whales and is also considered the largest animal to have ever existed in the world. 2  An adult blue whale can measure up to 108 feet in length and can weigh nearly 200 tons. a. The blue whale is the largest of all whales and is also considered the largest animal to have ever existed in the world. 2  An adult blue whale can measure up to 108 feet in length and can weigh nearly 200 tons. a.