The two-barred crossbill or white-winged crossbill is a small passerine bird in the finch family Fringillidae. It breeds in the coniferous forests of North America and the Palearctic.
Image: Whitewingedcrossbillmale 09
Image: White winged Crossbill female
Egg, MHNT
Crossbills are birds of the genus Loxia within the finch family (Fringillidae), with six species. These birds are characterized by the mandibles with crossed tips, which gives the group its English name. Adult males tend to be red or orange in color, and females green or yellow, but there is much variation.
Crossbill
Red crossbill skull and jaw anatomy from William Yarrell's A History of British Birds (1843)
Image: Loxia curvirostra 2
Image: Loxia leucoptera Kittila 20110309