A batch of our ladies has reached that special time when they start laying. I wonder sometimes what that must be like. One day you're running around chasing bugs, eating grass, then - wham! You're laying an egg. I may be imagining things, but it seems like the new layers tend to be more vocal, clucking "bawk bawk BAWUK! bawk bawk BAWUK! when the time comes. The older experianced hens tend to hop in, do thier business and hop back out like it's no big whoop.
While the hens are figuring things out, their egg sizes can be quite variable. Both these eggs were laid by pullet hens. The one on the left probably has no yolk or no white, and the egg on the right is a double yolker.