Andrew Parker of the Australian Museum in Sydney holds a South American morpho blue butterfly, its brilliant iridescence produced by grooves similar to those found in fossils from 500 million years ago. Parker discovered the tiny grooves, similar to those found on a compact disc or hologram, that he says signal the emergence of the first colored creatures after nearly 3 billion years of drabness. The color evolution came during the Cambrian explosion about 540 million years ago.