SUMMARY 149 



is used : Blue jay, crow, white-breasted nuthatch, chickadee, 

 quail, grouse. 1 



SUMMARY 



Because of their feathers birds can be easily recognized. 

 The fore limbs are adapted for flying, and as such vary in 

 size. The feet are modified for swimming, running, perch- 

 ing, or tearing ; while the jaws are large and powerful, or 

 small and weak, depending on the habits of each bird. 

 The classification of birds according to their habits makes 

 it easy to learn about them. Birds are of great economic 

 importance in destroying many kinds of insects that are 

 detrimental to man. This explains why they must be 

 protected by law. 



FIELD SUGGESTIONS 



The plan for field study will be found too extensive for the time avail- 

 able in this course, but many are anxious to continue studying birds for 

 several years, and the plan in the Appendix suggests a systematic method 

 from the habit point of view. Certain parts of this plan should be under- 

 taken whenever birds are taken up in the course. Students will find this 

 an interesting way to spend part of the summer vacation. 



QUESTIONS 



How many birds do you know ? What do they eat ? Do they remain 

 all winter ? Which ones migrate ? Where do they nest ? What time of 

 year do the young leave the nest ? Why are the birds beneficial ? 



REFERENCES 



W. L. McAter, How to Attract Birds in North Eastern United States 

 Farmers' Bulletin 621. 

 Chapman, Bird Life. 



i W. L. McAter, How to Attract Birds. Fanners' Bulletin 621, 



