I have 3 -2month old Buff Orp Pullets that we have had for about 3wks or so now. They originally had the pale white sort of colored legs/feet that generally come along with the breed - however today when i let them out to range, I noticed theyre legs were a greenish color. They are housed with two Red Sex Link X's who are the same age & all of them are eating, drinking & acting fine. What does this mean ?!