I picked up three black sexlinks and a leghorn at tractor supply last spring and have been getting beautiful eggs for a couple of months. My confusion comes in the color of the eggs! One of the black sexlinks is laying a blue egg! The other two are laying a very dark brown egg with darker spots on it! What is going on! I have 14 hens and one rooster all together. There is no way I am mistaken as I watched the "black sexlink" lay the blue egg! What are your thoughts on this?