302 



ZOOLOGY 



the tropics. One species, the ruby-throated humming- 

 bird, reaches New England and Canada. These usually 



brilliantly colored 

 birds feed on insects 

 and nectar, which they 

 gather from flowers. 

 They fly with great 

 swiftness, nest in trees, 

 and lay only two white 

 eggs (Fig. 287). 



The Swifts have a 

 broad gape, and no 

 bristles at the base of 

 the bill. They have 

 habits much like swal- 

 lows, and are found 

 especially in the warm 

 parts of the world. 



FKJ- 287. Ruby-throated humming-bird :. . 



(Trochiius coinbris). Most species ot this 



family have salivary 



FIG. 288. Nest of chimney-swift. Photo, looking down chimney, by D. and S. 



