CHORDATA 





The fifth croup is the largest of all and practically idenl 

 with the group of singing birds, the songsters of many zoologists 

 (Fig. 349)- It is said, however, that no two zoologists agree 

 to how the group should be subdivided. We may merely i 

 the common names of some birds which represent more or less 

 distinct subdivisions : larks, pipits, wagtails, forktails, thrushes, 

 sparrows ( Fig. 350), flycatchers, bluebirds, blackbirds, robins, 

 nightingales, wrens, tailor birds, dippers, mocking birds, gnat 



Fie. 351. Paradisea, male bird of paradise. (From a photograph provided 



can Museum of Natural History.) 



catchers, swallows and martins, shrikes, waxwings, cedar birds, 

 greenlets or vireos, tits, true orioles, bower birds, birds of para- 

 dise (Fig. 351), jays, magpies, nutcrackers, crows, starlings, 

 honey eaters, sunbirds, creepers, warblers, tanagers, weaver 

 birds, American orioles, grosbeaks, North American sparrows, 

 finches, and canaries. 



CLASS VI. MAMMALIA 



The Mammalia (Lat. mamma, breast), like the Aves, are warm- 

 blooded Vertebrata, and just as feathers are characteristic oi 

 birds, so hairs are characteristic of mammals. Hairs are never 



