I am sad to report the loss of the four Bluebird nestlings.  After a 
couple of days of little activity I opened the box to find one dead 
nestling.    I can only assume that the #%*&@#* House Sparrows 
vandalized the nest box.  I am more determined than ever to learn how to 
shoot a gun filled with bird shot!!!!!  Of course I'll have to purchase 
'said' gun first!!!!

Thanks for the info about the Cornell Bluebird list.  Unfortunately the 
list doesn't have a TITLE so when a message hits my screen and I don't 
recognize the name of he sender I delete it as spam. :o{

Mundi