You can see the vascular area of the yolk sac, which is very similar to the shape of cherry, so it is commonly called "Cherry bead"
When the egg rotates, the yolk does not readily follow the rotation, commonly known as the "nail shell", the embryo and yolk sac vascular shape like a small spider, it is also known as "little spider.""
The shape of the yolk sac is like a stationary mosquito, commonly known as "mosquito beads". The yolk color is slightly deeper and the lower part looks like a crescent moon, commonly called the crescent moon
The egg yolk surface has a color slightly deep, slightly brighter spots, commonly known as "fish eye" or "white light beads.""
A certain temperature is generally around 35, the number of days of hatching, x09 eggs according to the characteristics
