ECOLOGY AND WILD LIFE CONSERVATION 487 



11. Why has the restoration of the waterfowl population proved to be a nearly 

 impossible task? 



12. Why do most people have such a bad opinion of predators? 



13. Why are hawks and owls considered to be useful to the farmer ? 



14. Explain why predators are called the doctors of the wild. 



15. How do Canadian parks keep their herds of deer healthy and in balance with 

 the food supply ? 



16. Explain the factors leading to the catastrophe on the Kaibab Reservation. 



17. How can farmers improve wild life habitat? 



18. Why is burning over land so detrimental to wild life? 



19. Describe the operation of a farm pond for food fish. 



20. What is the importance of a chain of migratory bird refuges ? 



