Thiollay (1991) described four types of vocalizations of Red-throated Caracara:
1) Loud, raucous calls that have a rallying and territorial function. This is the most frequently heard vocalization, often used when a group of caracaras is traveling. This is the vocalization that other authors have described as "loud, racucous calls of cao ca cao, ca ca cao, kee yow-w-w, with other variations" (Wetmore 1965); "a hoarse, trumpeting khaaow! or ghaahee'ow!, sometimes varied to ca-ca'o, ca-ca-ca-CA'O!. At a distance suggests a macaw" (Stiles and Skutch 1989); and "loud, complaining screeches, screams, and caterwauls, often in chorus, some notes monosyllabic, kyeeer, others multisyllabic: Ki-ki-KAAAWWW (the source of a vernacular name, tatatáo)" (Lane, in Schulenberg et al. 2010). Territorial vocalizations are described as loud, raucous screams that can be heard for more than 300 m.
For a representative audio recording with sonogram, see audio
2) alarm calls, which are "rapid, high-pitched, almost cackling" (Thiollay 1991)
3) calls of foraging birds, which are "short, faint, creaking contact calls" (Thiollay 1991)
4) begging calls, which are "soft, plaintive, whining" (Thiollay 1991)