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
The true finches are small to medium-sized passerine birds in the family Fringillidae. Finches generally have stout conical bills adapted for eating seeds and nuts and often have colourful plumage. They occupy a great range of habitats where they are usually resident and do not migrate. They have a worldwide native distribution except for Australia and the polar regions. The family Fringillidae contains more than two hundred species divided into fifty genera. It includes the canaries, siskins, redpolls, serins, grosbeaks and euphonias, as well as the morphologically divergent Hawaiian honeycreepers.
Image: Pyrrhula pyrrhula female 2
Image: Bullfinch male
Euphonias, like this thick-billed euphonia, were once treated as tanagers instead of finches.
American goldfinch (Spinus tristis) male (left) and female (right) in Johnston County, North Carolina, USA
