A Crop Circle is a geometric pattern normally found imprinted in crop fields, but also known to be formed in Sand dunes and native grass lands.
The term "Crop circle" entered the Oxford English dictionary in 1990.
Crop circles have been found on every continent on Earth except Antarctica.
It was claimed in 1991 by Doug Bower and Dave Chorley, that they had started making crop circles in 1978 as a prank - this however doesn't account for crop circles found outside of England, or previous to 1978.
In 1880, the publication "Nature" reported an investigation by John Capron into a crop circle discovered in Surrey England.
A group of ancient geoglyphs found in Peru, are the Nazca lines a precursor to the modern Crop circle?
The lines are thought to have been created between 200BCE and 700CE - they span an 80 km area on an arid and high plateau between the towns of Nazca and Palpa
The hundreds of motifs include animals such as monkeys, hummingbirds, fish, spiders and plants, ranging from easily created, to highly complex designs.
The designs can only be seen in their entirety from the air, does this mean the Nazca people had the ability of flight? Jim Woodman believed so, and using techniques available to the Peruvians at the time recreated a simple hot air balloon that could of been used to view the massive drawings.