See its beak at the top left of the nest? And its closed eye? And some portion of its sibling on the right.
I did have to stick my camera up there and use my flash for this picture. Later, when I was giving Miracle-Gro to my plants nearby, the parent flew away leaving a wide-open beak waiting for food. The beak shut after a few minutes. No peeping. I guess they stay quiet so predators won't know they're there.