Once a caterpillar has disintegrated all of its tissues except for the imaginal discs, those discs use the protein-rich soup all around them to fuel the rapid cell division required to form the wings, antennae, legs, eyes, genitals and all the other features of an adult butterfly or moth.
View full size image. Diving to depths of 328 feet (100 meters) to munch on millions of krill each day, the blue whale takes the prize for the largest creature alive (and ever to exist!). These blue-gray giants extend about 80 to 100 feet (24.4 to 30.5 m) in length and weigh about 400,000 pounds (181,437 kilograms).
African elephants are currently the largest animals on land. They have a similar life-span to humans and can live to be 70 years old. The largest living bird is the ostrich. They live in Africa and have the largest eyes of any land animal-each eye is 5cm wide. A group of animals called arthropods includes insects, spiders and crabs. The largest ever was a sea scorpion called Jaekelopterus which could grow to 2.5m long, but it went extinct millions of years ago.