This thread is to help distinguish between a duck and chicken egg. A duck egg will be more yellow on the inside, the two eggs I am using for comparison are a Blue Swedish duck egg and an Easter Egger Amuaricana egg. Both are the same color blue. The duck egg is on top, the chicken on bottom, the duck egg will usually be rounder and not as long. It also has a kind of sheen to it that most chicken eggs don't. Below is the duck egg. Below is the chicken egg. To candle I use my phone(IPhone 6s) and hold the flashlight up to the bottom of the egg.