AVES 413 



to a certain extent in America, on account of the plumes which 

 are extensively used as ornaments. Besides the types men- 

 tioned there are a number of extinct forms belonging to this 

 division, some of which have become extinct in recent time. 

 ALpyornis is one of these, formerly a native of Madagascar, 

 where remnants of its eggs have been discovered showing that 



Fig. 212. 



Fig. 212. Wood Duck {Aix sponsa). Photographed by Dr. J. W. Folsom. 



its volume was about six times that of the ostrich egg, i.e., 

 having a capacity of about two. gallons. 



Division II. Carinatw (with a keel). — Birds with the keeled 

 breast bone, the wings, and the other organs of flight usually 

 well developed. Barbs of the feathers have barbules. All the 

 modern flying birds are embraced in this group. 



The further subdivisions of the Carinatag, as given in the 

 recent classifications, based upon internal structure, are regarded 

 by the author as unsuited for beginners. An older arrangement 

 of the principal orders, based upon habits and certain super- 

 ficial features, is presented below for the convenience of the 



