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).
The blue whale is truly the worldâs largest animal. Almost 100 ft long and 180 metric tons, itâs the largest animal ever known to exist. The largest population of blue whales can be found in the arctic, and while these beautiful, peaceful creatures have been hunted mercilessly by man, they still survive and live to swim another day.