Nuthatch

This photo was taken at the RSPB site at Baron's Haugh, Motherwell during April 2010.
The technical information is as follows.
Camera - Canon EOS 50D
Shutter speed - 1/100
Aperture - f5.6
Lens - Canon EF 500mm f4.0 L IS USM
Focal Length 500mm
ISO 400
Tripod