Two-headed snakes are rare, but they shouldn't be
looked at as freaks. Each two-headed animal is highly
individual, and has its own personality and reasons
for doing things the same as any other creature.
Polycephaly is a condition of having more than one
head. The term is derived from the Greek stems poly,
meaning 'much' and kephali, 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
Polycephalic animals often make local news headlines
when found. The most commonly observed two-headed
animals are turtles and snakes. Other species
with known two-headed occurrences include cattle,
sheep, pigs, cats, dogs, and fish. In 1894, a two-headed
partridge was reported in Boston, Massachusetts.
It was notable as a dicephalic animal for surviving
into adulthood with two perfect heads. Scientists
have published in modern journals about dissecting
such animals since at least the 1930s. A 1929 paper
studied the anatomy of a two-headed kitten...
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