Tammy / Bluebird Fanatic

This is only my second year with BSP, but am enjoying it tremendously.  Last year I got my boxes up too late to get a Bluebirds to nest, so I kept them up all winter, and made sure they were clean and ready to go in the spring.  I have spotted 2 females & 1 male Bluebird.  Usually only 1 female & 1 male come in to feed, but at times I see the females fight at the boxes.  I was jumping for joy when I noticed the female start to build a nest in my PVC box.  She worked feverishly for hours.  I thought for sure she would have the whole nest built in that time(remember I’m new to all this).  After I noticed neither bird at the box I went & checked & the floor was just covered, nothing else. Again I thought there would be more of a nest there.  Also I noticed two doors down a neighbor put up a box, and now it looks like this pair is building in both boxes.  Is that common??????  Could it be the male has a different female for each box.  I haven’t noticed any nest building since.  Does it always take this long.  Any feed back would be appreciated.  I am soooooo excited to have my first nest of Bluebirds in my box (hopefuly my box).  The whole 2 nest building things & 2 female thing is what has me stumped.   Please give me some insight.  Also I’ve never done this blog thing either so be patient with me.

Tammy/Bluebird Fanatic