AVES. 



4 2 5 



geographical distribution, the degree of exactness in routes and the place 

 of return. 



4. Make a special study of the birds of the locality in which you are. 

 Are there permanent residents? Summer residents? Winter residents? 

 Migrants (those which stop only for a short time in the spring or autumn 

 as they pass from south to north or the reverse) ? Keep a record from 

 year to year of the earliest dates at which migrating species are seen 

 in your locality. 



FIG. 229. 



FIG. 229. Loggerhead Shrikes (Lanius ludovicianus) . By J. W. Folsom. 



5. What diversity is there in the mating habits of birds? Are any 

 monogamous'? Polygamous? What are the mating habits of the cuckoo? 



6. Make a report as to, the nest-building habits of selected species of 

 birds. How do the nests differ in location, in mode of formation, in 

 perfection? Is there any relation between the character of the nest and 

 the degree of development of the young when hatched? What range of 

 variation in the number of eggs? In the mode of incubation? The period 

 of incubation? Care of the young after hatching? 



7. Compare the vocal powers of birds with that of vertebrates hitherto 

 studied. Compare various types of birds as to the range and character of 

 their notes. How are the notes of birds related to their states of mind? 



