IO4 



THE ANIMALS AND MAN 



ing begin? How long does it last? How soon after finish- 

 ing the nest are the eggs laid ? Are all the eggs laid at one 

 sitting? Do both birds take part in incubation, i. e., sitting, 

 or but one, and if but one, is it the male or female? What 

 does the other do? How long before the eggs hatch? Do 

 they all hatch at the same time? 



After hatching the care of the fledglings should be well 



FIG. 45. Oriole's nest with skeleton of bluejay suspended from it; the 

 bluejay probably came to the nest to eat the eggs, became entangled 

 in the strings composing the nest, and died by hanging. (Photo- 

 graph by S. J. Hunter.) 



watched. Do both parents bring food? How many times 

 is food brought in one hour, or if so much time can be given 

 to continuous watching, in two or three? What is the food? 

 Is the nest cleaned ? If so, how often ? When are the first 

 flying lessons given? How long do the young birds con- 

 tinue to come back to the nest at night after they first leave 

 it? 



