Grey Heron with Frog

This photo was taken at Edinburgh Park during March 2006 and shows a Grey Heron with it's lunch.
The technical information is as follows.
Camera - Canon EOS 300D
Shutter speed - 1/250
Aperture - f8.0
Lens - Sigma 50-500mm f4-6.3 APO EX HSM
Focal Length 500mm
ISO 400
Filter - UV