sentences:  They tend to relate sounds to relationships more than the grey parrots, and therefore outperform the grey parrots in more social environments.The African grey parrots ("Psittacus") are particularly noted for their advanced cognitive abilities and their ability to talk.There are two commonly kept species of which the Timneh parrot ("Psittacus timneh") tends to learn to speak at a younger age than the Congo parrot ("Psittacus erithacus").