These are Crested Caracaras. The adults are striking birds and are relatively common from southern Texas to South America. They are classified as falcons, look like hawks and behave like vultures. Primarily carrion eaters I saw them regularly on road killed animals when I lived in southern Baja California. My wife took this shot in Costa Rica. While they are usually the dominant bird on a carcass, in this location (where vultures were baited), they were not. The King Vulture was the dominant bird and this pair of Caracaras was patiently waiting for their turn.