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Although it is patterned like a sparrow, its shape, actions, and callnotes all reveal that this bird is really a goldfinch in disguise. After nesting in the conifer woods, Pine Siskins move out into semi-open country, where they roam in twittering flocks. They often descend on fields of thistles or wild sunflowers, where they cling to the dried flower heads, eating seeds. In winter they sometimes invade southward in big numbers, with flocks coming to feeders along with American Goldfinches.