A wildlife photographer requires perseverance above all, says Fritz Polking. Wildlife photography can never be regarded simply as trophy hunting with a camera, nor can technique ever be an end in itself. Mastery of technique, creativity, a hunter's instinct and a knowledge of biology are all prerequisites for the attainment of a higher goal, which is to embody ideas and imagination in wildlife photography. Polking speaks of his photographs as 'thought pictures'. By this he means images which find their best expression through the medium of photography. They bear comparison with other forms of artistic expression, such as painting, literature and music. The photographer must illuminate not just the joy and excitement of the natural world, but also its tragic aspects. To represent joy and sorrow with the same equanimity, says Polking, is to have achieved the highest level of artistic merit in this profession.