176 AVES (the bird) 



4. Voice. 



(1) Make a list of those that sing. 



(2) Do you notice different calls or tones by the same 



bird? 



(a) Are they for different purposes? 



(b) What emotions or information do birds express by 



voice? 



(3) Give some of the names applied to the calls of various 



birds. 



5. Nesting Habits. 



(1) Make a list of birds which build their nests upon the 



ground. 



(2) Of those that build in trees. 



(3) What general truth do you observe concerning the 



colors of birds which stay most of the time on the 

 ground? Is this true of their color ventrally? 



B. Special Study 

 Select one or two birds which you have an opportunity to 

 watch closely, and report upon the following points: 



1. Nesting Habits. 



(1) Which builds the nest, the male or the female? Or do 



both? 



(2) Does the male feed his mate or does he watch the nest 



while she gets her food? 



2. Food. 



(1) What is their food? 



(2) Which feeds the young? What does it feed them? 



(3) Judging from this food, are they of use or harm to the 



farmer and fruit-grower? 



(4) When (what time of day or night) do they feed? 



(5) How do they secure their food? 



(6) What adaptations for securing food have they? 



(7) Name some adaptations for securing food which you 



have noticed in other birds. 



(8) Does this bird ever store its food? If so, how and 



where? If not, do you know of any bird which does? 



(9) How does this bird drink? Do all birds drink that way? 



(Watch the pigeon drink.) 



