A mummy is a corpse whose skin and organs have been preserved by either intentional or incidental exposure to chemicals, extreme coldness, very low humidity, or lack of air when bodies are submerged in bogs. Presently, the oldest discovered (naturally) mummified human corpse was a decapitated head dated as 6,000 years old and was found in 1936.
The most famous Egyptian mummies are those of Seti I and Rameses II (13th century BC), though the earliest known Egyptian mummy, nicknamed 'Ginger' for its hair colour, dates back to approximately 3300 BC.
Mummies of humans and other animals have been found throughout the world, both as a result of natural preservation through unusual conditions, and as cultural artifacts to preserve the dead. There are more than 1000 mummies in dry Xinjiang China.