BOARD WHICH CAN'T APPROACH MAGPIES WITH NEEDLES

摘要

The present invention prevents the magpie from building a house by preventing the magpie from placing its feet on the telephone pole (all facilities).;The following description is not limited to silk magpies and telephone poles, but presupposes that magpies are all birds, and that (3) can be changed to a bird's house where the birds do not want to sit.;According to this paper, magpies can fly to flat or inclined objects while sitting on ground, buildings or branches, but they cannot sit on top of thin, pointed and vertical objects.;Therefore, by attaching a thin and pointed thing vertically to the complete (3), the magpie is not designed to attach the feet at all, so that the magpie can not be built.