I think that is from your BO, looks like the same shape as the ones I get from my Chocolate Orpington, but hers are way lighter in color more a light peachy color. Those are the dame color as the ones I get from my Barred Rock.
I have 6 (3 Easter Eggers, 1 Rhode Island Red, 1 Barred Plymouth Rock and 1 Australorp) that are squatting and singing, but no eggs yet. Can't wait to see what color eggs my EE's lay.
I have a 19 week old Barred Plymouth Rock that has started squatting for me, no egg song yet, but it's coming any day now, she is super talkative. I also have 1 Australorp, 3 Easter Eggers, and Rhode Island Red no squats from them yet, but it's gonna happen soon they are all 19 weeks, got them...