Cockatoos are extremely social bird with better talking ability. Cockatoos can imitate a wide range of sounds. But their talking ability entirely depends upon quality of training. There are different species of cockatoos in the world. Among them, rose-breasted cockatoo, yellow crested cockatoo and long-billed cockatoo are better talkers. 
Cockatoos need special care from their owner to learn speaking. They have a tendency to copy the words that are repeated by the owners on regular basis.