Large chickenlike bird with a long tail. No similar species in limited range; much smaller than Crested Guan and warmer brown than Sickle-winged Guan. Note contrasting reddish-brown head; wings and tail also rufous but more easily visible in flight. Nearly endemic to Ecuador, but occurs in extreme southwestern Colombia and northwestern Peru. Look for pairs or small groups in the mid-levels of forest and edge, up to around 1,800 m. Like other chachalacas, has a very raucous and exceptionally annoying voice.