A mummy is a body, human or animal, whose skin and organs have been preserved by either intentional or incidental exposure to chemicals, extreme coldness (ice mummies), very low humidity, or lack of air when bodies are submerged in bogs, so that the recovered body will not decay further if kept in cool and dry conditions. Some authorities restrict the use of the term to bodies deliberately embalmed with chemicals, but the use of the word to cover accidentally desiccated bodies goes back at least to the 1730s.
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. At this context, the oldest known naturally mummified human corpse is a decapitated head dated as 6,000 years old, found in 1936 at the site named Inca Cueva No. 4 in South America on the other hand, the oldest-known deliberate mummy is a child from the Camarones Valley in Chile, and dates from around 5050 BC., it belongs to Chinchorro mummies, that are dating to thousands of years before the Egyptian mummies (perhaps the most known and famous).
Deliberate mummification is a feature of some ancient South American cultures in areas which, like Egypt, have very dry climates (Wikipedia).