How big is small?

This morning,this little wren flew into my coservatory and and decided to fly out through the glass.
And saw a few stars for a wee bit.
With her flat out on the tiles ,I feared the worst ;but on picking her up, first one eye flickered open ,then the other.
I had about 30 seconds to marvel at her tiny size, and rattle off a few pics as I held her gently in my hand whilst she came to.
And then she was gone ; flying off as though nothing had happened.
For which ,I am greatly pleased.