In Saint Petersburg live white cats twins Iriss and Abiss. They have heterochromia, there are different colors of eyes. Cats less than a year, but they are already known around the world. And it is easy to understand why: you just look at them.
Scheme of conception of identical twins is quite standard: one egg plus one sperm. But soon after this is a very mysterious phenomenon: the embryo has already passed certain stages of formation, it suddenly splits into two identical halves. Why is that the splitting can not yet explain no one.
These kids are very similar to each other. Some of them are copies of one and the same person. True twins have the same gender, same appearance, same color of hair and eyes, shape of ears, teeth morphology, similar weight and height, blood group and sometimes even fingerprints.