Birds nest

I discovered today that we have a sparrows nest in our dormer window. I had heard some wee scratching noises in the roof space and thought the worst - Rats! but while doing a spot of gardening this morning I saw a sparrow squeeze through a space under the dormer soffit.

Why am I relieved to discover that the noises were in fact small birds? is it that they are much cuter than rats? is it that sparrows don't suffer from the old 'black death' tag (hard to shake). whatever the reason, I am secretly pleased and slightly chuffed that this little family has chosen to share my house. Stupid I know.