CLASS AVES (BIRDS). 319 



of the eggs of any conceivable use? Which sex incubates 

 the eggs? Condition of the young at hatching as com- 

 pared, for example, with the chick. What care is given 

 by the parents to the young? What part is taken by the 

 male? How often and with what are they fed? How 

 long in the nest? 



Determine and describe the powers of song. Are they 

 equally developed in all individuals of the species? Can 

 you cite any evidence to prove that the power of song is 

 of any use to the bird? 



Migrations. Are there any evidences of winter or 

 other migration? If not, how is the winter spent? If 

 so, at what time does it occur? When does the species 

 return? Secure information as to where it has been in 

 the meantime. 



Power and peculiarities of flight. Other modes of 

 locomotion. Is its power of perching well-developed? 

 Characteristic motions or positions. 



What are its relations to other animals of the locality? 

 Has it any enemies? Is it hostile to any species of animals? 

 Does it in any way help or hurt human interests? Show 

 in what way and to what degree. 



What is its abundance or scarcity in your locality? 

 Can you assign any explanation for the facts you have 

 observed? Does man have any influence in this respect? 



II. General External Appearance. The regions of the 

 body head, neck, trunk, limbs. Make a record of every- 

 thing you can discover in respect to these regions, their 

 relation to each other, their size, the organs and parts 

 which they show. 



The covering of the body. Compare the color of all 

 the visible parts. Is there any color-pattern? If so 

 how is it formed? Select specimens of all the types of 



