THE FIRST PROBLEM OF BIRD LIFE. 141 



very different from each other. Find out the places each pre- 

 fers to live in and how he hunts his food, then see if these 

 facts will not explain why the heron's neck and beak and legs 

 are so long, why the gull's "wings are so strong, and why the 

 loon, though it cannot walk much nor fly easily, is a better 

 fisherman than either of the others. 



