Crossbill The Crossbill (Loxia spp) is a member of the finch family of birds. They look quite chunky compared to most of their cousins, with a large head and a distinctive bill. Adult males have a brick-red coloration, while females have a greenish-brown hue. Related Articles: Discover Common Finches in the UKCrossbill (Loxia spp) Species Guide: Appearance, Diet, Habitat, Behavior, Stats, And Conservation StatusFine Art Prints