In other words: if you buy a dozen eggs from a seller, do you expect them to all be fertilized? Or is it common to have up to, say, 1/3 be unfertilized? I have 20 eggs in the bator now, and it's day 11. There are eight eggs that I can't identify as having been fertile. A few are crystal clear; the others have mottled or dark shells that I just can't see anything specific. Then there are a few others that have the blood ring, which I guess means they were fertile but didn't develop, right? I expected that to happen, but I didn't expect to have so many questionable ones by now. Should I say anything to the seller, or does this sound common for shipped eggs?