236 ZOOLOGY. 
The smallest bird in the United States, except the hum- 
ming-bird, is the gold-crested kinglet {Regulus satrapa), 
which is less than 9 cm. (3f inches) in length. Lastly 
Fig. 278.— Black- throated Green Warbler. 
Fig. 279.— Winter Wren. 
come the bluebird, the melodious thrushes, and the mock- 
ing-bird, while at the head of the entire class of birds in 
this country stands the robin {Turdus fuigratorius). 
