I have only ever incubated chickens, so I’m not sure if guineas should look like this. Are these two eggs dead? The first two pictures are the same egg, the second is a different. They have dark spots that don’t look like embryos. I’m thinking the last one could be a blood ring, or at least the start of one. I’m not sure though because I’m a complete newbie on guineas. My cousin just gave me some eggs to incubate. These dark marks developed recently between the times I’ve checked the eggs. They are on day 13 of incubation.