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Vermont Birds

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20 hours ago, Colorado Birder said:

Sparrow of some sort ... ? did not look like Song Sparrow seen in CO

In addition to the phenotypic differences based on geography, these birds are also molting and juvenile (respectively), so they're more ratty and dull than most Song Sparrows you're accustomed to.

Circling back to phenotype, Song Sparrow phenotypes get darker the farther northwest you go. Individuals from populations in Alaska (e.g. sanaka, maxima, rufina) are dark and long-billed and look like completely different species from those in Arizona (e.g., fallax), which are pale and short-billed.

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