Siamese

Siamese, are twins which are still together after birth. This is very inusual, in 200.000 births only 1 use to be siamese but the half part use to death. This fact is usually found in females twins.
There isn't a scientific explication for this fact still, but scientists think that it's a problem of a recesive gen.
Might think that the drugs used for fertility produce this kind of phenomenon, but has not yet been proven that these keep some relationship, although there is a connection between these drugs and multiple births.

Classification of seamese twins
Siamese twins are cataloged by the body parts which they share.

·Symmetrical

Symmetrically conjoined twins are rare and a complex problem. This is rare, because it occurs in exceptional cases. Many born dead, but at present a lot of them survive but they required surgery for their separation.

·Asymmetric

In the case of conjoined twins asymmetrically, one of which is smaller and depends on the other. The smaller, usually incomplete, acts as a kind of parasite.
these are Daisy and Violet Hilton. Her mother rejects them at birth, and her midwife adopted them. They lived from 1908 to 1969.

Yoyu can see this video, which shows siamese life, nowadays: http://www.youtube.com/watch?v=zPMXi1xAwn0