I was building a nesting box to encourage birds in my garden. It worked, a week ago a family of Blue Tit moved out after a stressful time. I'm curious so I got up to box to check what they left. I was surprised by the size of the nest and would like to know:
1) To raise the chance of having another couple doing their business inside this year do I need to clean or better leave as much as possible of the material inside and do the cleaning in late autumn (or early spring next year)?
2) As it can be seen below 3 eggs "didn't work". Is that normal for blue tits or this an indicator for a buggy box or place?
3) I hope GL.SE is the right place for asking this question?!
