All the above factors, it is clear, are detrimental to the growth of wild life. Yet animals and birds are necessary. Man needs them first of all to retain the balance in the world of nature: he also needs them to keep a part of himself alive for the tenderness which birds and animals arouse is perhaps the most unselfish emotion. Medical and scientific experiments have used animals to benefit mankind. Sociologists and psychologists also depend on studies of animal behavior in order to understand human behavior.
Preservation of wild life means preventing the