A scarecrow is a device, traditionally a human figure dressed in old clothes, or mannequin, that is used to discourage birds such as crows from disturbing crops.
The scarecrow idea has been built upon numerous times, and not all visual scare devices are shaped like humans. The "Flashman Birdscarer", Iridescent tape, "TerrorEyes" balloons and other visual deterrents are all built on the idea of visually scaring birds. This method doesn't work so well with all species, considering some birds may be spotted landed on the scarecrow.
A bird scarer is any one of a number devices designed to scare birds, usually employed by farmers to dissuade birds from eating recently planted arable crops.
They are also used on airfields to prevent birds accumulating near runways and causing a potential hazard to jet aircraft.
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