DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY
Siamese piglets (Sus scrofa domestica). They are fused in the chest region and share an umbilical cord, but have their own heads, forelegs and hindlegs. Siamese twins may be joined only superficially, or may share most of their organs. As with identical twins, siamese twins result from the fertilisation of a single egg cell, but with siamese twins the division is incomplete.
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