. Bird-lore . where billows ofsomber green spruces and firs stretch away on every hand, broken only byinnumerable lakes and streams and outcroppings of cold gray rock, thecheerful songs of the Olive-backs may be heard to best advantage, oftenmingling with those of the Hermits that occupy the same region. Thequiet of evening is the favorite hour for their most extended vocal efforts,although they often sing during the day, while the Hermits are apt to besilent save in the early morning hours and toward dusk. Perched high in atree, whence they may spy any one approaching and dive into the neares
. Bird-lore . where billows ofsomber green spruces and firs stretch away on every hand, broken only byinnumerable lakes and streams and outcroppings of cold gray rock, thecheerful songs of the Olive-backs may be heard to best advantage, oftenmingling with those of the Hermits that occupy the same region. Thequiet of evening is the favorite hour for their most extended vocal efforts,although they often sing during the day, while the Hermits are apt to besilent save in the early morning hours and toward dusk. Perched high in atree, whence they may spy any one approaching and dive into the nearest A Sketch of the Thrushes of North America 107 underbrush, they pour forth successive bursts of rippling melody. While thesong lacks the variety, the deliberation and the spirituality of that of theHermit Thrush, it flows with an irresistible swing that fairly eclipses theHermits best efforts. In the dry air of the Pacific coast their ringing tonesseemed to me to be even clearer and sweeter than in the BREEDING RANGES OF THE HERMIT THRUSHES \ HylocUMa I. H. s- R-iiata. 2. H. g. pallasi. i. H. g. auduhoni. 4. B g. nana They are much shyer and more restless than are the Hermits, althoughthey carelessly place their nests five or six feet from the ground, commonlyin small spruces, where they are very conspicuous. The sitting bird crouchesmotionless in the nest if surprised, but is generally able to slip away unob-served and flit about silently with its mate in the adjacent bushes, sometimesuttering a liquid puk of alarm. Along the Maine coast and along nearly the whole coast of California, io8 Bird - Lore these birds breed at sea-level, and they have clung to their favorite haunts, thespruce forest, wherever it has been spared by the lumberman and the it is that they occur along the higher Alleghanies as far south as Penn-sylvania, in the southern Rocky Mountains at about 8,ooo feet altitude andin the Sierras and ranges of Nevada at varying altitudes. When the vas
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