Almost trapped

Another very cold day here in the north east of Scotland.
Lots of snow about.
This morning, I was watching the starlings squabbling over food on a bird feeder in our garden when I noticed a wren hopping about. The wee bird squeezed under a space in our greenhouse door and then was trying to get out.
I opened the door, and after flying against the glass a couple of times, she flew out of the door.
It was good luck that I happened to see her go into the greenhouse as otherwise she might well have been trapped there.
I will have to keep checking in future.