Cardinalidae (often referred to as the 'cardinal-grosbeaks' or simply the 'cardinals') is a family of New World-endemic passerine birds that consists of cardinals, grosbeaks, and buntings. It also includes several birds such as the tanager-like Piranga and the warbler-like Granatellus. As such, membership of this group is not easily defined by a single or even a set of physical characteristics, but instead by molecular work. In general they are medium to large songbirds with stout features, some with large heavy bills. Members of this group are beloved for their brilliant red, yellow, or blue plumages seen in many of the breeding males in this family. Most species are monogamous breeders that nest in open-cup nests, with many taking turn incubating the nest and taking care of their young. Most are arboreal species though the dickcissel is a ground-dwelling prairie bird. (Source: Wikipedia.org, CC BY-SA)