I cracked an egg open for breakfast this morning and found two yolks, one completely normal and the other hard, round and filled with blood. My chickens are all acting normal and I don't have any idea who laid the egg. The strange yolk is the one on the spoon. I had to use a sharp knife to cut it open. The inside was filled with blood red gel. This is the only one I have come across and none of my friends have ever seen a yolk like it. Any ideas? Could I have a sick chicken? Or maybe this is just a one time thing? To be honest, it really grossed me out and i couldn't eat breakfast after that.