An Atlas Moth or Attacus atlas, photographed at www.ButterflyWorld.com, Pompano Beach, FL. Atlas moths are considered the largest moths in the world in terms of total wing surface area. Adults do not possess fully formed mouth parts and therefore do not feed; throughout their 1–2-week adult life they survive entirely on larval fat reserves that they build up while they are caterpillars.
Females are sexually passive, releasing powerful pheromones which males detect and hone in on with the help of chemoreceptors located on their large feathery antennae. Males may thus be attracted from several kilometers downwind. Photo Copyright 2003 Robert Giordano.
Description from Wikipedia