78 SUBJECTIVE LESSONS. 



In what manner is the wing sexually adorned ? How is 

 it used as a musical instrument ? How may it express 

 emotion ? 



The Tail (Chapter II, pages 25-27). — Mention some birds 

 in which the tail is sexually developed. What is the tail's 

 main office ? Give illustrations of its relation to the char- 

 acter of flight. What birds use the tail as a prop ? De- 

 scribe the tail of the Motmot. How may the tail express 

 emotion ? Give illustrations. 



The Feet (Chapter II, images 27-30). — What relation ex- 

 ists between the feet and wings ? Give illustrations of the 

 relation between the structure of the feet and the manner 

 in which they are used. On w^hat is length of foot some- 

 times dependent ? Describe the Jacana's toes ? Of w^hat 

 assistance are they to the bird ? What birds use the feet 

 in scratching for food ? What birds use the foot as a 

 hand ? Of w^hat special use is it to the Birds of Prey ? 

 Mention several species which use the foot as a w^eapon. 

 Describe the seasonal modification in the feet of Grouse. 



The Bill (Chapter II, pages 30-34).— To w^hat human 

 organ does the bill correspond in use ? Mention some of 

 the functions of the bill. What is its most important 

 office ? What does the bill in effect become ? To what is 

 its shape in Hummingbirds related ? Give illustrations. 

 What is a marked character of the bill of some fish-eating 

 birds ? How is the bill used by some shore birds ? Give 

 illustrations. Describe the shape and uses of the Huia- 

 bird's bill. 



Colors of Birds. 



Color and Age (Chapter III, page 36). — What is the 

 character of the nest plumage of birds that run or swim at 

 birth ? Of birds that are reared in a nest ? Give illus- 

 trations. What plumage follows the nest plumage ? Does 

 it resemble that of the parent ? How long is it worn ? 

 Does the immature plumage sometimes differ from that of 

 the adult ? Give illustrations. When does the Bobolink 

 acquire his full plumage ? When, the Orchard Oriole ? 



Color and Season (Chapter III, page 37).— When the 



