Everytime I mowed lately I had noticed that I heard a bird or two squawking when I got to a certain place in the yard. Well, I found it. First I found the blue shell on the ground and figured something got to the nest first. After finding the nest I discovered the shell was just thrown out during house keeping. Can't quite tell but it looks like there are three Robins. Could always be a fourth hiding because at first I thought there were only two.