Crossbills are birds of the genus Loxia within the finch family, with six extant and one extinct species. These birds are characterized by their mandibles with crossed tips, which gives the group its
Red crossbill skull and jaw anatomy from William Yarrell's A History of British Birds (1843)
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.