I didn't get over to my neighbor's house to videotape Chicks #1 and 2, but here's some pictures of Chicks #3 and 4, who are still being fed by Beaker and Chauncy Sue.
Chicks #3 & 4 (left to right).

Chick #3, in his after dinner pose.

Close-up of Chick #3's very full crop.

Chick #4, also in his after dinner pose. You can
see how full his crop is after his parents "topped off"
his tank for the night.

A close-up of Chick #4's head, for those who wonder
where bird ears are located. Thanks to his current state of
baldness, this chick's left ear is easy to see.