16 Weird & Amazing Bird Facts Around The World
In 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.
Read more: http://scienceray.com/biology/16-weird-amazing-bird-facts-around-the-world/#ixzz0y2Le0dlZ