The Pacific Coast Races of the Bewick Wren
The Pacific Coast Races of the Bewick Wren
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They are but slightly reddish above, and with a grayish cast not seen either in charienturus or in typical drymoecus. As to the pre- cise region occupied by these latter birds during the breeding season, that, of course, is problematical, for they might have wandered even from over the crest of the Sierras; but their appearance leads to the assumption that they represent an ex- Vol. VI] SWARTH— RACES OF BEWICK WREN 73 treme southern outpost of Sierran drymoecus, where that race abuts on eremoph...ilus. The grayish cast of the dorsal surface may well be explained as evidence of intergradation between the two.
From Walnut Creek and Mount Diablo, Contra Costa County, there is a series of two adults and 12 juvenals. The adults, June birds in excessively worn plumage, bear no re- semblance to the ruddy colored spilurus of the nearby coast region. The young birds, too, lack the clear reddish tone of Palo Alto juvenals, and are very similar to young birds from the Sacramento Valley. The series is unsatisfactory in the lack of fresh plumaged adults, but is apparently to be referred to drymoecus, though tending toward the coast form spilurus.
What to read after The Pacific Coast Races of the Bewick Wren?
You can find similar books in the "Read Also" column, or choose other free books by Harry S Harry Schelwald Swarth to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
They are but slightly reddish above, and with a grayish cast not seen either in charienturus or in typical drymoecus. As to the pre- cise region occupied by these latter birds during the breeding season, that, of course, is problematical, for they might have wandered even from over the crest of the Sierras; but their appearance leads to the assumption that they represent an ex- Vol. VI] SWARTH— RACES OF BEWICK WREN 73 treme southern outpost of Sierran drymoecus, where that race abuts on eremoph...ilus. The grayish cast of the dorsal surface may well be explained as evidence of intergradation between the two.
From Walnut Creek and Mount Diablo, Contra Costa County, there is a series of two adults and 12 juvenals. The adults, June birds in excessively worn plumage, bear no re- semblance to the ruddy colored spilurus of the nearby coast region. The young birds, too, lack the clear reddish tone of Palo Alto juvenals, and are very similar to young birds from the Sacramento Valley. The series is unsatisfactory in the lack of fresh plumaged adults, but is apparently to be referred to drymoecus, though tending toward the coast form spilurus.
What to read after The Pacific Coast Races of the Bewick Wren?
You can find similar books in the "Read Also" column, or choose other free books by Harry S Harry Schelwald Swarth to read onlineMoreLess
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