The image on the left is of less than 1 week old Great Blue Heron Chicks. The chicks are barely visible at the front of the nest near the nearest parent's legs, downy heads and some of the chick eyes can be seen.
The second image is one month later and they stand nearly as tall as the parent who is feeding the chicks (the chick on the right has a bit of bloody red morsel hanging on it's beak. It will be another month before they are ready to fledge.
Seen at Almaden Lake, San Jose, California.
DSC08666-050725 & DSC02632-060425