There is a bird of family starlings(a bird species) that they have made their house in a postbox. They nested there one year ago as well. This postbox has no longer than use for post because Royal Mail is not allowed to disturb this family of nested birds. Royal mail has asked people to use nearby postboxes instead, although is 3 miles away from there. This happened in Scotland. I love these news. it's quite fun actually. It's quite common in the UK to save these birds especially wild animals that who have to live with where people live for instance foxes.