Whose laying these eggs??

[Island Juli]

I've got 6 month old silkier mixes that started laying nice little cream colored eggs. Now I've gotten 2 days in a row a tiny brown no-yolk egg. I can't figure out whose laying them! The rest of my flock are 4 9 month olds, and several 3-5 year olds. Here's a pic of some of my eggs.

 

[oldhenlikesdogs]

Which ever chickens egg matches the color of the small one is your most likely suspect.