Subject: Will a bird continue to sit on a nest with dead baby birds in it?

There is a nest under my eaves, I think of a nuthatch.  We used a mirror once to 
look in it and saw 5 eggs.  Checked again and couldn't really see well, but it 
looks like one egg and several dead baby birds!  The mother is still using the 
nest, and is in it at night and frequently throughout the day.  I would have 
expected her to abandon it.  Is this bird crazy, in denial, or what?

Re: Will a bird continue to sit on a nest with dead baby birds in it?