Apparatus for inhibitively preventing birds from crowding

Abstract From the Canadian patent

Birds, especially pigeons dislike the presence of a, magnetic field because each bird has a biological instinctive ability of sensing the presence of the magnetic field. In order to utilize this biological instinctive sensing ability for the purpose of preventing birds from crowding at the upper part of a building, a plurality of magnetic members are disposed on an arm(s) turnably held at the uppermost end of a support column. When a bird perches on the arm the latter is, turned by the action of his own dead weight resulting in the, bird amazingly flying away from the arm. It is effective that a rotary wind blade having two magnetic members immovably secured to the opposite sides thereof is …