Eastern Bluebird

I originally thought she had 2 worms in her mouth, but now that I have the photos to examine I think she just has one, holding it in the middle. I used my husband's lawnmower's trailer as a blind so I could get a little closer today. I also think she may be feeding caterpillars to her young, cutting down on my butterflies. I guess that is part of the natural cycle. Just one I don't like.