Water Rail and Chick

This photo was taken at Little Boghead Nature Park, Bathgate, during July 2012.
The technical information is as follows.
Camera - Canon EOS 5D Mk II
Shutter speed - 1/800
Aperture - f9.0
Lens - Canon EF 500mm f4.0 L IS USM plus Canon Extender EF 1.4x II
Focal Length 700mm
EV -1/3
ISO 1600