196 VERTEBRATES 



Corvidae, The Crows and Jays. 

 00. Birds of small size; (wing less 

 than 4). 



P. Bill not notched. 

 Paridae, The Nuthatches and Tit- 

 mice. 

 PP. Bill notched toward the tip, 

 very slender. 



Sylvidae, The Old World War- 

 blers. 

 NN. Nasal feathers erect or directed 

 backward, not covering nostrils ; bill 

 rather slender, the culmen convex ; 

 first primary not very short. 



Troglodytidae, The Wrens and 

 Mocking Birds. 

 JJ. Tarsus booted, without distinct scutella ex- 

 cept near the base; rictal bristles present. 



Q. Birds of small size; (Wing 

 less than 3) ; young unspotted. 

 Sylvidae, The Old World War- 

 blers. 

 QQ. Birds of moderate size; 

 (wing more than 3) ; young 

 spotted. 



Turdidae, The Thrushes. 



Summary. — Why is the normal temperature of the body 

 of a bird several degrees higher than that of any other 

 animal? Do you suppose it would be warmer if it were 

 stripped of its feathers? Does it hurt a goose to pluck its 

 feathers ? What would become of the feathers if they were 

 not plucked? 



Do you think birds are sensitive to pain? Do you think 

 the singing birds should be killed? Do you think wings 

 and bodies of birds are proper ornaments for hats? 



