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Bird - Lore 



the curves. Starting from its lowest ebb in 1901, the species rose in abundance 

 until it reached its maximum. Since then there have been two more waves of 

 abundance, reaching their cumulations in 1907 and 1910 respectively. In 

 neither of these years, however, was the bird so abundant as in 1903. It should 

 be noted that no birds except the Redpoll and Pine Siskin have ever reached 

 the lowest mark of the Chickadee. 



In sharp contrast to the curve of the Chickadee stand the curves of the 

 other common winter birds — the White-breasted Nuthatch, Brown Creeper, 

 and Downy Woodpecker. The curves of these birds are very regular, showing. 



Chickadee (12.2) . 



Redpoll (4.22) 



Pine Siskin (2.58) 



White-breasted Nuthatch (1.6) 



Downy Woodpecker (1.4). 



Pine Grosbeak (1.22). 



Brown Creeper (0.68). 



Red Crossbill (0.14) 



L 



FIG. III. AVERAGE ABUNDANCE 

 WINTER BIRDS (1901-igii) 



White-winged Crossbill (0.48) .... 



Red-breasted Nuthatch (0.25) . . . , 



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