I show a horse eating grass under water. Horses that have been around or lived or brought up in pasture or wild situations will know how to do this. Other horses will learn how to do this by watching and hanging out with horses that do it. Horses need horses to teach younger inexperienced horses how to be horses so when they get older they can pass this on. Horses that are caged and locked up learn how to be caged and dysfunctional horses passing on bad and dysfunctional behaviors.