372 QUESTIONS. 
wings, legs. 5. How do they roost when asleep? 6. How does the 
circulation differ from that of reptiles? 7. Why are they warm. 
blooded? 8. How do they breathe? 9g. How are birds covered? to. 
Describe a feather. 11. Describe the development of birds. 12. What 
are the peculiarities of lizard-tailed birds? 13. Describe the toothed 
birds. 14. What is meant by flat-breasted birds? Give an example. 
15. Define a keel-breasted bird, and give examples. 
MAMMALS.—1. What is meant by a mammal? 2. How is it 
distinguished from the birds? reptiles? 3. Describe the skull. 4, 
What is the use of the backbone? the ribs? tail? 5. Describe the limbs 
and their uses. 6. Describe the digestive process. 7. How does it 
differ from that of birds? 8. Describe the circulation of blood. 9. 
Is there anything about the blood-corpuscles that reminds you of the 
amoeba? 10. Describe the process of breathing. 11. How does it 
differ from that of birds? of reptiles, fishes, insects? 12. What are the 
uses of the nervous system? Designatethem. 13. Define the develop- 
ment of a mammal, 14. What are the great groups of mammals? 
15. Define the monotremes. 16, In what do they resemble the rep- 
tiles? 17. How does their development differ from that of other 
mammals? 18. What are the general characteristics of marsupials? 
1g. What is a placental mammal? 20. Define the sirenians. 21. 
What are the general characteristics of whales? 22. Do they spout 
water? 23. How is whalebone used? 24. Define the insectivora. 
25. How do their teeth differ from those of other forms? 26. Define 
the bats. 27. How do they pass the winter? 28. How is the wing- 
membrane supported? 29. What organs for clinging besides claws 
have some bats? 30. Define a rodent. Give examples. 31. Does the 
porcupine throw its quills? 32. Define the ungulata. 33. Describe 
the hyrax. 34. What are the characteristics of elephants? 35. De- 
scribe the tapirs, rhinoceroses, horses. 36. How do the hippopota- 
mus, peccary, etc., differ from them? 37. Define a ruminant. 38. 
Describe the process of digestion. 39. How are the horns of deer 
reproduced? 40. Is there an exception to their casting? 41. What 
deer has long canine teeth? 42. How do the bovide differ from the 
deer family? Give examples. 43. Define the carnivora, 44. How 
do bears often pass the winter? 45. How do the seals differ from 
other carnivora? 46. Define the primates. 47. How may the monk- 
eys be grouped? 48. What are the characteristics of the higher apes! 
49. Into what general groups is the human race divided? Give ex- 
amples. 
