Parrot Cries With Its Body [verified] -

Parrots are highly empathic and sensitive to changes in their environment. When a parrot is overwhelmed or frightened, their chest muscles will vibrate rapidly.

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.

A possible interpretation: