scholarly journals Geographic Variation in the Ontogeny of Beak Coloration of Gray-Breasted Jays (Aphelocoma ultramarina)

The Condor ◽  
1991 ◽  
Vol 93 (2) ◽  
pp. 448-452 ◽  
Author(s):  
A. Townsend Peterson
2008 ◽  
Vol 34 (3) ◽  
pp. 288-302 ◽  
Author(s):  
Julie N. Oswald ◽  
Shannon Rankin ◽  
Jay Barlow
Keyword(s):  

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