Canadian Bernikle once the animals were considered to be a nice man, and quite harmless. Currently, in some places they are considered to be harmful individuals. They even work in this direction, the spring podbiera eggs from their nests, and hunters kill most adult individuals during their flight. People invented yet another way, given they are pokarmach contraceptives. Birds are also a burden, in order for people living in parks. There are green lawns overlapping thick layer of manure, which turns into a mud. All of these individuals are, however, a unique species, as among the small group of animals that easily adapts to changes in habitats altered by man.