Our baby bluebirds

This year (2015) we put up a bluebird box.  Some days later, we found a single piece of grass inside it. Apparently bluebirds had moved into the box.  They kept building a nest.  Finally the nest was finished.    A couple days later we found pale blue eggs about the size of a grape in the nest.  A couple weeks later, the eggs hatched.  It will take about 3 weeks for the babies to develop before they leave the nest.  Here are some pictures from our nest.