Chestnut-sided Warbler, Setophaga pensylvanica |
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![]() Above, a singing male in breeding plumage; below, a month later in the year in the same place, Deer Isle, Maine, a male molted to non-breeding plumage. |
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![]() The more extensive black mask and chestnut stripes distinguish the breeding-plumage male, above, from the female, below. The female is gathering nesting material in May. |
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