Red-shouldered Hawk (Buteo lineatus) [XC351211]
by Dan Kopp from Bonelli Park, North shore, Los Angeles County, California, United States (call)
Red-shouldered Hawk (Buteo lineatus) [XC615035]
by Richard E. Webster from Washington Township (near Long Valley), Morris County, New Jersey, United States (call, duet)
Subspecies
Sometimes placed in Asturina. Apparently close to Ridgway's Hawk (Buteo ridgwayi), Roadside Hawk (Rupornis magnirostris) and, to a lesser extent, Grey-lined Hawk (Buteo nitidus).
The following 5 subspecies are recognised:
elegans Cassin, 1855 - Southern Oregon (north-western USA) to northern Baja California (Mexico).
lineatus (Gmelin, 1788) - Eastern North America, from southern Canada to central USA.