From this same photo, I have extracted the window to show the detail in the stained glass. The main feature is clearly a bird of some sort, but I don’t recall seeing any reference to it anywhere.

Canon EOS 350D, Sigma 70-300 APO DG Macro @ 70 | ISO 400 | Av | 1/500s f4 -2/3
Saturday, July 15, 2006