20. Why do birds preen or dress their feathers? 21. What can you tell me about the feet of water birds? 22. What can you say about wading birds? 23. What kind of a bill has a duck? 24. How and why does it differ from a hen’s bill? 25. How are the beaks of fish-eating birds formed? 26. What can you learn of a bird’s habits from examining its feet and beak? 27. What can you tell me about the ostrich? 28. Why is the pigeon such a thirsty bird? 29. How does a swallow feed? 30. Tell me of the shrike, or butcher bird. 31. What different kinds of food do birds eat? 32. What can you tell me of the woodpecker family? 33. Will you tell me how and why birds migrate? 34. Tell me the history of the bobolink. 35. Describe an oriole’s nest. 36. Tell me about a humming-bird’s nest. 37. How do some birds ornament their nests? 38. Do birds ever build a roof over their nests? 39. What are some of our best singing birds? 40. What can you tell me of the blue jay? 41. Tell me how birds care for and defend their young. 42. What birds lay eggs in other birds’ nests? 43. What are some of the enemies of birds? 44. What birds can be called street and field cleaners? 45. Tell me any curious things you have seen or heard about birds. 46. Mention some of the lost birds. 47. How did these birds become extinct? 48. What are the different families of the parrot tribe? 49. In what countries do parrots live? 50. What can you say of their food and habits? 51. Where do canaries come from? 52. Of what color are they in their wild state? VI. 1. On what plan is a fish built? 2. In what element do fishes live? 3. Where do you suppose men got their first boat patterns? 4. What fish is usually described as a pattern fish? 5. Will you describe a perch? 6. What part answers to the boat’s prow? 7. What part serves for a rudder? 8. How many fins has a perch, and where are they? 9. Which fin is used chiefly for motion? 10. What can you tell me of the eyes of the fish? 11. What use do the gills of a fish serve? 12. What does a fish breathe? 13. Does the fish need oxygen or carbon? 14. How does it get oxygen from the water? 15. Why do fish pant and struggle when taken from the water? 16. What fishes will live longest out of water? 17. What causes the fish taken out of water to die? 18. Where and what is the bladder of the fish? 19. Tell me about the backbone of the fish. 20. What can you say of the other bones of a fish? 21. What do you know about the scales? 22. What senses have fish? 23. How many senses have you? Name them. 24. What kind of blood have fish? 25. Is a whale a fish? What is it? 26. What are some of the largest fishes? 27. What are some of the smallest? 28. Do fishes differ much in form? 29. How do they differ in regard to their eyes? 30. What fishes have no scales? 31. What do some fish have instead of scales? 32. Will you describe fish of the ray family? 33. Describe flat fish.