While a normal snake would give most people the creeps, the sight of a two-headed snake must be tremendously gruesome. The two-headed monsters of myth may have a basis in reality. Two-headed snakes are rare and odd creatures, but not unheard of. Most recently a two headed Russels viper was found in Bastora near Mapusa. Santosh Naik a snake rescuer, was called on the pretext that a snake had entered someones house. He was in for a surprise only, to discover this magnificent creature.
The term for this is "Polycephaly". It is a condition of having more than one head. The term is derived from the stems poly- meaning 'many' and kephal- meaning "head", and encompasses bicephaly and dicephaly, both referring to two-headedness. A variation is an animal born with two faces on a single head, a condition known as diprosopus. In medical terms these are all congenital cephalic disorders. So these anomalies do exist and are a much more common sight in snakes, than any other two-headed animals.
In truth, two-headed snakes are merely conjoined twins, connected to each other via their organs or body parts as with other twins that are connected. This means that a two-headed snake could be joined to the other sharing the same organs, but one being a parasitic head. Even in captivity, there are problems. Snakes operate a good deal by smell, and if one head catches the scent of prey on the other's head, it will attack and try to swallow the second head. What strange weird animals! Well atleast that would better than a snake eating it's own self. Lets take a look at this video.
Two-headed snakes do not have a long life expectancy, particularly in the wild. Each head has a brain and, usually, some control over the shared body, and the two cannot communicate with each other. Movement is therefore difficult, as each head may try to travel in a different direction, and in the worst case scenario, the heads may fight or try to eat each other. Some two-headed snakes share a stomach, while others have a stomach for each head. In a two-headed snake with separate stomachs, one of the heads may die if it routinely loses fights over food. Even if there is only one stomach, two-headed snakes may not be able to capture prey if the heads are competing for food.
So are two heads better than one? Well, despite several difficulties, two-headed snakes have been known to live up to 20 years in captivity. Researchers have theorized that the inbreeding of snakes for zoos and pets may lead to an increased incidence of two-headed snakes, but this is very difficult, if not impossible, to verify, as it would entail getting an idea of how often double-headed snakes are born in the wild. The fact that they would not live very long makes the task even more daunting.