Consider "Paco," a 25-year-old African Grey whose owner died suddenly. The new owner reported that Paco never screamed. In fact, he was "the quietest parrot ever." But the new owner called a behaviorist because Paco had begun vomiting his food (regurgitation without bonding intent) and sitting on the bottom of the cage.
Physical signals are often the first "cry" for medical help, as parrots instinctively hide illness until it is severe. Parrot Cries with Its Body
Why does a parrot cry with its body instead of screaming? Volume attracts predators. In a home environment, a bird that has learned that screaming results in being covered or yelled at (negative attention) will suppress the vocal cry and escalate the physical one. Consider "Paco," a 25-year-old African Grey whose owner