Blackbird on the nest

Over the past few weeks, Andy M has been watching a female Blackbird refurbish a nest in his garden (from a suitable distance so as not to disturb her).  In early March, the female was very much coming and going, and was seen carrying nest material at one stage. However, now she is quietly sitting and watching, and not moving off the nest when we walk around.  I strongly suspect this means she is now incubating eggs.

Female Blackbird on the nest 

(photo taken with a long lens from a suitable distance away)