Bird Study. 809 



7. How is the work of construction carried on? 



8. How is the nest Hned? 



9. Do both parents work at the construction of the nest? 



10. Do both the parents sing? 



1 1 . When does the first egg appear ? 



12. How many eggs in the nest and the length of time between the 

 laying of the first and the last egg? 



13. Describe the eggs in a general way, the color, the markings 

 and size. 



14. How long after the incubation begins before the first bird is 

 hatched ? 



Photographed by Geo. W. Fiske. 



Young of the Yellow Warbler. 



15. Do both parents take turns at sitting on the nest? 



16. Does one bird feed the other on the nest? 



ly. \\'hen the eggs are hatched do both birds help feed the young? 



18. Describe the young when hatched. 



19. How long after hatching before the eyes of the young birds are 

 open? 



20. How long before wing feathers appear? 



21. How long before the young birds are able to leave the nest? 



