CHORDATA 



349 



greater or less extent migratory. Sometimes the Pygopodes 

 included with two succeeding suborders, the Turbinares and the 

 Gaviae, in a single suborder called the Cecomorphoe ; while others 

 comprise the Pygopodes and the Gaviae in the Cecomorphae and 

 recognize the Turbinares as a distinct group. For the present 

 we may keep the three groups distinct. 



Suborder 2. Turbinares 



The Turbinares (Lat. turbo, a top or cone) include the alba- 

 trosses, ocean birds with remarkable powers of flight, and the 

 petrels, of which the most familiar are the stormy petrels, popu- 

 larly called Mother Carey's chickens. The wandering albatross 

 is the largest water bird in existence and is said to attain a 

 stretch of wing of over four meters. 



*& 



Suborder 3. Gallinae 



The Gallinae (Lat. gallina, hen) represent the group in the 

 older system of classification known as the scratching birds. 

 It is a very large group and probably includes more species 

 used for food than any other group of birds. The young are 

 precocious. Here belong the quails, partridges, and grouse. 



1' "'■• 345- Meleagris, a wild turkey of South America. (From a photograph provided by 

 the American Museum of Natural History.) 



