The word "pig" wouldn't hurt if you knew better than the wonderful animals with that name. They are not what many people think they are. Now science reveals many secrets of one of the oldest and wisest friends of man. There are twenty species on Earth out of a billion snoring, eating and thinking pigs. They live in the shroud, wander through the swamps, wander through dense forests and live at home. The first ancestors of such mammals appeared 40 million years ago. These are such different species: A forest pig. African warthog. Wild boar. Bearded pig. Domestic breed. All members of the pig family have a "nickel" on their nose, good canines, paired hooves on their feet and a short twisted tail. The largest in weight and size reach 400 kilograms and 2 meters in length. The grey colour of the skin is diluted with brown, white or spotty shades. The pig's body is covered with long, bristly hair, often smeared in mud. Mud baths are needed to get rid of skin parasites. The excellent sense