I've got 5 chicks that are about 10 days old and I have to say that I am astonished at how instinct drives their behavior, despite never having a mother hen to show them how to behave. The first thing they started doing was digging for stuff. They don't get very far before they get to the bottom of the brooder. But they will all stand around, scratching through the bedding, get to the bottom, and then peck at little bits of wood. I'm starting to see some behavioral differences between the different chicks too, dominant, submissive, vocal, quiet. The chick that makes the most fuss when you try to hold her was just playing some sort of game with the others. She would pick up something in her beak, start peeping loudly and running all around the cage. Well the others were quite curious, following her around and trying to steal what she had in her beak. They're in a brooder with just water, chick feed and various sizes of aspen shavings. It's not like she's gone and found a big old roach or grasshopper that they want to steal from her and eat. But she sure is acting like she found one and is getting them to chase her around. Funny critters.