The Common Crossbill is a small passerine bird in the finch family Fringillidae. It breeds in the spruce forests of North America, where it is known as Red Crossbill, as well as Europe and Asia; some populations breed in pine forests in certain areas of all three continents, and in North America, also in Douglas-fir. It nests in conifers, laying 3–5 eggs. This crossbill is mainly resident, but will regularly irrupt south if its food source fails. This species will form flocks outside the breeding season, often mixed with other crossbills.

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