Various types of animals show different kinds of expressions when they are happy. These expressions can be in the form of sound, touch, or through a specific form of body movement. Similarly, when a cat is found to be happy they often tend to run their heads against their favorite human being or a particular favorite object. By doing this the cats release a large quantity of pheromones from the glands present in their cheeks and forehead. This type of method is also used by cats to mark their territories.