I couldn't resist uploading these two images of four cute and comical swallow chicks. I think the one on the right is singing a different song to the others.
The nest was tucked under the beams of an archway between two buildings. The chicks were barely visible in the nest until a parent appeared when they would leap up and start loudly chirping with their beaks wide open, each trying to be the one that got fed.
Thanks for looking.