PFM-1 () is a scatterable high explosive anti-personnel land mine of Soviet and Russian production. It is also known as a Green Parrot or Butterfly Mine. The mines can be deployed from mortars, helicopters and aeroplanes in large numbers; they glide to the ground without exploding and will explode later upon contact. Design The mine consists of a polyethylene plastic container containing 40 g of explosive liquid. The two wings of the PFM-1 allow it to glide after being released in the air, then spin, stabilising it and slowing its descent. The thick wing contains the liquid explosive. The two wings together are 120 mm (about 5 inches) long. The plastic body can be moulded in a variety of colours for best camouflage. As existing stocks were in European green rather than sand coloured, the first examples used in 1980s Afghanistan were green and easily visible. This led to their name 'green parrots'. The shape and bright colour is attractive to children, inspiring claims that they were deliberately designed to look like a toy. This was denied by the Soviets and, while the mines did endanger children, there is no evidence to suggest they were designed to look appealing. The mine comes in two variants: PFM-1 and PFM-1S. The only difference between the two variants is that the PFM-1S comes with a self-liquidation mechanism, which activates within 1 to 40 hours, depending on the weather conditions. The mines cannot be laid manually and must be laid only using minelaying systems, such as remote mining machine UMZ, portable mining kit - PKM (mortar), and those present on MLRS, helicopters (VSM-1 mine system) or airplanes. The remote minelaying systems can only use cluster munition containing PFM-1 mines. The cassettes that contain the PFM-1 mines are KSF-1 (72 PFM-1), KSF-1S (64 PFM-1S) or KSF-1S-0.5 (36 PFM-1 and 36 PFM-1S). Because the mine is so light, it can be carried in waterways and move downstream after heavy rains or melting snow. The PFM-1 mines are notorious for attaining good camouflage in the conditions of dense foliage, snow or sand. Action The mine is stored with a pin restraining a detonating plunger. Once the arming pin is removed, the plunger is slowly forced forward by a spring until it contacts the detonator, at which point it is armed. Deformation of the soft plastic skin of the mine forces the arming plunger to strike the detonator,