I have just wet dashed the house, and forgot to put the vent grill back for shower extractor, kids noticed starling taking straw etc in, so iv had to leave it till the chicks have left.....
Downside is... Chicks gave hatched in ceiling above bathroom, the parents have pecked/ripped through extractor pipe and are rearing young ontop if 200mm of cosy wrap now... And I get woken very early by them haha, can't wait till they leave