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The American goldfinch (Spinus tristis) perches on a thistle plant in Toronto, Ontario, Canada, on August 2, 2025. American goldfinches utilize thistle plant down to line their nests and also consume thistle seeds. This behavior is so characteristic that they are sometimes nicknamed 'thistle birds'. The downy material from mature thistles provides insulation for the nest, and the seeds are a primary food source, even for nestlings. (Photo by 51³Ô¹ÏÍø Touch Imaging Ltd./NurPhoto via Getty Images)