The collared doves are infrequent visitors, being seen typically once a month, almost always flying in as a pair. The above photo (August 2004) being a typical view as they briefly inspect the lawn.
 

However, in the Spring of 2006, the birds seemed to be around most of the time and the pair below were foraging for nesting materials rather than food, so I imagine they may be breeding close by.

Next bird

Photographs below - April 2006