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THE RIVER-SIDE NATURALIST. 



evening with a loud hum ; hence its name, Dor-Hawk. 

 The peculiar churning, or rather croaking, noise is de- 



scribed by Wordsworth in his poem, "The Waggoner." 

 This sound may be 'heard at a considerable distance : 



" The dor-hawk ; solitary bird, 

 Round the dim crags on heaving pinions wheeling, 



With untired voice sings an unvaried tune. 

 Those burring notes are all that can be heard, 



In silence deeper far than that of deepest noon." 



