(Eurasian) Jay
Garrulus glandarius

A fairly common relative of Crows and Magpies, they are often very shy. They are also quite intelligent and hide acorns for the winter and are able to recall where they have buried them months later.
 

  

1: Sandhurst Balancing Pond, 06/06/2006.
2: Sandhurst Balancing Pond, 01/01/2007.