34 ALLEN'S NATURALIST'S LIBRARY. 



with an array of pen-feathers. As soon as these have reached 

 a development which makes the youngster look like a sma 1 ! 



Young Kingfisher, to show the pen-feathers. 



Porcupine, the sheath breaks and falls off, and the feathers 

 cover the body at once. 



THE SWIFTS. SUB-ORDER CYPSELI. 



The Swifts and the Night- Jars have generally been associat 



-I 



in recent classifications of birds with the Humming-Birds, as 

 forming an Order Machrochires. The association of the Swifts 



