“It’s the construction of a butterfly or moth from caterpillar soup,” said my friend David James, an entomologist at Washington State University. He studies the science behind metamorphosis, or how a creature transforms.
Before becoming butterflies, caterpillars enter the pupa stage where they build that little sack, called a cocoon or chrysalis. The chrysalis protects the caterpillar as it begins to turn itself into a liquid, soupy substance.
Read all of this Ask Dr. Universe column here.
A service of WSU, Ask Dr. Universe answers some of the most interesting, tough and smart questions from curious kids all around the world.