And Then There Were Two

Yesterday I reported our first observations of a Blue Bird youngster on the property.  But with photo evidence today, I must stand corrected.  There are two.  So our presumptive first bluebird brood was more successful than I expected.  With two healthy juveniles the bluebirds would appear to have had the best fortune of the various species who are summer regulars.  At least I have not seen other pairs of fledglings.  What is more, I don't see the parents with them.  Does that mean things are advanced enough for the adults to start a second brood?  And if so, did they abandon our box?  I'll have to do a little more investigation.