Hi, we’ve got a nesting box on our shed and we had noticed that some blue tits had started nesting. A couple of weeks ago chicks hatched and there were quite a few in there and the parents had been back and forth all day every day. Today we hadn’t seen them at all so decided to take a look and there are 3 dead chicks and the parents haven’t been back for hours. Do we just leave the nest as it is or do we clear it all out. Thanks