Image © Norman Day. Please do not reproduce without permission.
(High quality original available - please enquire)

Two male specimens of Papilio warscewiczi (subspecies mercedes), the one on the left being the normal form of this species, while that on the right is a unique, one of a kind, individual showing both wing pattern aberration and wing shape deformity. A highly-prized specimen, it is unlikely that a similar one will ever be seen again. This stunning specimen is also figured on two other websites:

http://www.insectcompany.com/oddities/papilio-warswiczi-deformity.shtml

http://thornesinsects.com/en/mounted.html?&insect_type=mounted%20insects

Both originate from Peru: left specimen - Upper Huallaga Valley, February 2004; right specimen - Carpish, at 3000m altitude, May 1992.

Camera mounted on a copy stand (see "super-macrophotography" gallery) and set to auto iso, exposure +2, anti-shock 10 seconds, no flash.