image creditIn Russia the keen eyesight of the pigeon is put to a very practical use for, at one factory in Moscow, they are used to sort ball-bearings. After four or five weeks special training, the birds inspect the ball-bearings as they pass on a conveyor.
If any show the least blemish the pigeons peck a special plate which operates a reject sign, the faulty bearing is removed and the birds is rewarded with a few millet seeds.
16 Weird and Amazing Bird Facts from Around the World.
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