Can't count?

Did anyone notice my error? If you look at my red birdhouse and count the holes you will see I counted wrong. I have a 6 story birdhouse, not 5. Also we put it up higher as was suggested by my new friends. I think it looks better this way.
I went to a one-room school years ago but I did have good teachers who taught me to count. (I'm so embarrassed.) Anyway my birds have one more place to stay. Hope they come soon.