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.
Dreadnoughtus Credit Jennifer Hall. 1  PHILADELPHIA â Eighty-five feet long, 30 feet tall, 130,000 pounds and still growing when it died, a newly described dinosaur is among the largest land animals that ever lived â so big its discoverers are calling it the Dreadnoughtus.