I have 18 week old Wyandottes, 17 week old Dominiques, and 16 week old Plymouth Rocks (the Wyandottes may be 17 weeks and the Dominiques are 18, but I'm pretty sure it's the other way around). I though, since they will be laying soon, I wanted to teach them "egg laying 101". What I did, was take a nice, medium, brown egg from my fridge and set in inside their nest box with a little extra straw. I watched over them, so they get familiar with the concept of an egg without them breaking it, a habit I want them to know. But, after 20 minutes they started moving the straw to the sides of the egg, making sure no straw is on the egg, the egg is clean, and also they sat near it. Is this normal behavior? I wouldn't think they'd care for an egg when they haven't seen an egg before (with the exception of when they were first hatched, but they probably don't remember that). So why are they doing this, with no previous experience, no hen that does it before to teach them, at such a young age? PS: Some where sitting on the egg! It was only for a few seconds so I didn't think it was worthy enough to mention. And they never sat exactly on the egg. Just barley touching it on their bottoms. It didn't look like brooding though (definitely not at this age), but it looked like they were guarding it.