Like any other animal, human beings have developed certain physical and behavioural traits. Some of these traits, such as a new born baby attempting to suckle the breast, are rooted in millions of years of past experience and can be thought of as instinctive. We can observe such traits in a dog in such behaviour as cocking of the leg in male dogs. We can see some of our own traits in such things as the human desire to elect leaders. Many of these habits are psycho-biological or social. In our dreams we represent these drives or habits in the form of various animals. Our restrained sex drive or aggression may be shown in our dream as a dog on a lead. The power of drives such as the urge to parenthood via sex might be shown as a horse which we are trying to control. More than anything else though, our dream animal represents our powerful feeling reactions to situations – reactions developed through centuries of human experience in frequently terrible situations. This aspect of ourselves is rooted in the older portions of the brain.