Which raptor is characterized as a black, raven-sized bird with a white band at the tail's base?

The raptor that is black, raven-sized, and has a distinctive white band at the base of its tail is the Harris's hawk. This species is known for its unique coloration and size, resembling a large dark bird with striking features. The white band on the tail is a key identifying characteristic that helps distinguish it from other raptors.

Harris's hawks exhibit social behavior and often hunt in groups, which is relatively uncommon among raptors. Their adaptability and sociability, in addition to their physical attributes, make them noteworthy in the world of falconry. Other species mentioned, like the red-tailed hawk, peregrine falcon, and American kestrel, have different coloration and characteristics that do not match this description. The red-tailed hawk, for example, generally has a more mottled appearance and is significantly larger than the size of a raven, while the peregrine falcon is known for its speed and distinctive markings. The American kestrel, being smaller and featuring different plumage, does not possess the described traits of being raven-sized with a white tail band.