244 



VERTEBRATA 



FIG. 278. Catbirds and nest. Photographed in the Academy of Natural Sciences, 

 Philadelphia. 



Humming Birds and Swifts (Macrochires) 



This order includes the smallest of birds and also a few 

 larger species. The most notable member is the ruby- 

 throated humming-bird feeding on the nectar of flowers, sap 

 of trees, and insects. The chimney swift, building its nest 

 of sticks glued together with saliva, and fixed to the chim- 



