speckled sussex egg

My little flock has two each of Amberlinks, Australorps, and Speckled Sussexes. Somebody is laying eggs every day, and I don't know whom to thank. I'm guessing it's the Amberlinks. One of them squats. I did a butt check on one of the Amberlinks, and her vent was wide open, and I could get three...