156 



VEKTEBRATA: AVES OR BIRDS. 



to those of a woodpecker. They are very active and move 

 along the trunks and branches, searching in the cracks for 

 insects, upon which they feed. 



The Wrens or Troglodytidse are a large group of very 

 small, and exceedingly active, plain-colored birds, more or 

 less related to the Creepers, Nuthatches, etc., but readily 

 distinguished by their general form, which is well shown 



FIG. 172. 



Titmouse or Chickadee, 

 Pants atricapillus, T.inn 



FIG 174. 



FIG. 173. 



Nuthatch, 

 Sitta Carolinensis. 



FIG. 175. 



Brown Creeper, Winter Wren, 



Certhia familiaris. Troglodytes hyemalis, Vieillot. 



in Fig. 175. Audubon says that the song of the Winter 

 Wren excels that of any other bird of its size with which 

 he is acquainted. 



