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Earl Rubin — July 11, 03:03PM

beak color variability within a species

I had a pair of evening grosbeaks here near Winchell Lake AB yesterday, 10 July. The illustrations in the bird book show individuals with light / tan colored beaks while the individuals I sighted had beaks that were black. Is variability in beak color common? Is it age related, a function of local diet or genetics of the local population?


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