Animals cry. At least, they vocalise pain or distress, and perhaps call for help. Most people believe, therefore, that animals can be unhappy and also that they have such feelings as happiness, anger and fear. But there is a tremendous gap between the common sense viewpoint and that of official science on this subject. The ordinary layperson readily believes that his dog, her eat, their parrot or horse, feels. They not only believe it but have constant evidence of it before their eyes. All of us have extraordinary stories of animals we know well. Yet, by dint of rigorous training and great efforts of the mind, most modern scientists — especially those who study the behaviour of animals — have succeeded in becoming almost blind to these matters.