peacock butterfly

from The Century Dictionary.

• noun The io butterfly, Vanessa io, a common European species: so called from the eye-spots of the wings.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Inachis io, a red butterfly with distinctive large eyespots, of the family Nymphalidae.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun European butterfly having reddish-brown wings each marked with a purple eyespot