The Grey Parrot, Psittacus erithacus from Natural History of Parrots (1801—1805) by Francois Levaillant. almost 3 years 1 The Grey Parrot, Psittacus erithacus from Natural History of Parrots (1801—1805) by Francois Levaillant. almost 3 years 3 The Grey Parrot, Psittacus erithacus from Natural History of Parrots (1801—1805) by Francois Levaillant. almost 3 years 2 The Grey Parrot, Psittacus erithacus from Natural History of Parrots (1801—1805) by Francois Levaillant. almost 3 years 1