AGE OF BIRDS. 109 



three centuries; and geese, finches, and doves have 

 been known twenty years of age. 



Questions. 



In what situations do birds build their nests ? 



Mention the materials some birds use for building 1 . 



Which bird is the builder "? 



How does the male bird employ himself whilst his mate is 

 building 1 



What way is the nest of the tit preserved from wet ? 



What process affords a beautiful example of animal 

 instinct 1 



What would be the consequence if the mother left her eggs 

 exposed 1 



By whom has she been taught this 1 



To what age do some birds live ? 



K 



