In order to understand horses, one must know their natural behaviour. The wild horses of Dülmen have been observed for many years and this has revolutionized horse keeping. Sex and love in horses. Research of the Swiss National Stud in Avenches shows that horses choose the genetically suitable one when they have a free choice of partner and that fertility is significantly increased. Horses are athletes, money machines, leisure companions, movie stars and meat suppliers. If horses have no task, the species becomes extinct. From the difficulty of preserving old horse breeds. Wrong horse keeping causes massive problems. Horses are very social animals and wither away when kept in solitary confinement. Too little exercise and overfeeding leads to sick teeth, lung problems, colic and other diseases.