Even when they are fastened in, we hear them squawking during the night, they have good hearing as well.
One morning something had tried to get to the hens (they were OK), OH said he'd heard the geese clamouring and hadn't thought to mention it.
Could always make a weldmesh run+shelter to protect them from nasties at night?
That is actually giving ME ideas about resiting their housing, and making a safe outdoor run for them near the house. hmmmm

. there has been 'overnight problems' locally this last year or so.