Top-left detail of the nymphaeum - House of Neptune
Unfortunately no frontal view was possible at the day of visit - a closed room prevented such frontal view. This is a manipulated view from a CS5's "transform - horizontal tool".
D7000 + Micro-Nikkor 55mm f/3.5 ai hand held, ISO 800, f/5.6 at 1/125s. ~100% cropped.
It looks like a frugivorous phasianid (?).