With their goal achieved, parenting begins. Once you start observing the busy parents of demanding chicks, you understand there's no time leftover for singing!
A lot of the time, they don't have just one hungry chick either! They have a branch full of them like these Mountain Bluebirds.
This swallow was fed by a high speed parent who fed the chick "on the wing". By the way it was looking and stretching out of its box, I'm sure it took flight soon after I got the photo.
By far the loudest baby is the Clark's Nutcracker. These birds cannot be overlooked. It was quite impressive watching the parent flick a seed up into the squawking beak and the hungry chick catching it!