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Two male Common Crossbills (Loxia curvirostra), small passerine birds of the finch family. The crossbill is characterised by mandibles that cross at their tips, lending the group its English name. It feeds on conifer cone seeds, particularly those of spruce, Douglas-fir, and pine. The unusual bill shape is an adaptation to assist the extraction of the seeds from the cone. Photo credit: Elaine R. Wilson |
