This group gathers taxon/Bird Families subcategory members that are themselves bird families belonging to the order Passeriformes, the passerines or perching birds, the largest bird order by a wide margin, encompassing well over half of all described living bird species. It spans familiar songbird families such as Corvidae, the crows, ravens, jays and magpies, among the most intelligent birds known and capable of tool use and long-term memory rivaling some great apes, Muscicapidae, the Old World flycatchers, and Trochilidae-adjacent insectivorous families such as the flycatcher-like tyrant flycatchers of Tyrannidae, the largest bird family in the Americas, alongside nectar-feeding families such as Meliphagidae, the honeyeaters, concentrated in Australia and the Pacific. Nearly every family gathered here shares a distinctive foot structure, three toes pointing forward and one pointing back, that locks a perching bird's grip onto a branch even while asleep, and most possess a comparatively complex vocal organ, the syrinx, capable of producing the elaborate songs that give the group its common name.