The red-tailed hawk (Buteo jamaicensis) is a bird of prey, one of three species colloquially known in the United States as the "chickenhawk," though it rarely preys on standard sized chickens. It breeds throughout most of North America, from western Alaska and northern Canada to as far south as Panama and the West Indies, and is one of the most common buteos in North America. Red-tailed hawks can acclimate to all the biomes within their range. There are fourteen recognized subspecies, which vary in appearance and range. It is one of the largest members of the genus Buteo in North America, typically weighing from and measuring in length, with a wingspan from . The red-tailed hawk displays sexual dimorphism in size, with females averaging about 25% heavier than males. The bird is sometimes referred to as the red-tail for short, when the meaning is clear in context.