OBSERVATION OUTLINE 387 



Choice of materials. 



Workmanship, 



Shape, color, and position to protect from enemies. 

 Knowledge of number and color of eggs. 

 Actions toward Cowbird's eggs. 

 Protection of young. 

 Discipline of young. 

 Food obtained by work of other birds (ex. Fish Hawk 



and Eagle). 



4. Emotion expressed by 

 Use of crest, wings, tail. 

 Attitudes. 

 Movements. 



Voice. 



5. Range of Communication. 

 Calls of signal and warning. 

 Cries of anger, fear, pain, protest. 

 Songs of happiness and love. 

 Display of recognition marks. 



